February 2007 - dovecot

[Dovecot] Bug tracking system
by Timo Sirainen 26 Mar '07

26 Mar '07

There are three reasons why I haven't really bothered setting up a bug tracking system for Dovecot: 1) They're all kind of annoying to use. 2) They all require a lot of stuff like PHP, SQL server, etc. which I don't really want to put into dovecot.org. 3) Probably most importantly: If people start reporing bugs in there, I'm pretty much the only person who will ever read them and reply to them. Currently when people report bugs in here, it's quite useful to have other people read them too. They may already know the bug and say they've reported it, they may have an idea what's causing it, they may know a workaround, etc. All in all, moving things to BTS would most likely cause my life to be harder and it might be more difficult to get some bugs fixed. A couple of days ago I started thinking about this and then I figured out a way to solve all of this nicely with a new and great Dovecot based bug tracking system. :) Just so I won't forget it, here's the plan: Dovecot BTS ----------- The preferred way to report bugs is to send them to dovecot-bugs(a)dovecot.org. The only thing it does is prefix the subject line with [BUG #nnn] and forward it to dovecot(a)dovecot.org. Now everyone can reply to it just as it was a normal mailing list mail. As long the subject contains the "[BUG #nnn]" prefix, it's part of the bug. Existing mailing list threads can also be turned into bugs by replying to the thread's root message with To: dovecot-bugs(a)dovecot.org. This again causes the new reply to contain [BUG #nnn] prefix. Then comes the web part. There's no SQL database or anything, everything is stored in a mailbox in the IMAP server. The mailbox contains the whole dovecot(a)dovecot.org archive. Bug metadata such as priority, status, etc. is stored using IMAP ANNOTATE extension, which allows setting key=value pairs to messages. Unfortunately Dovecot doesn't yet support that extension. Bugs' root messages contain the annotations for the whole bug thread. So to get a list of all bugs, the BTS issues an IMAP SEARCH ANNOTATE command to list all messages with some specific "bug=yes" type of annotation. For those messages then it can fetch the subject and whatever else metadata it wants. Newly created bugs don't have annotations though. To fix that, the BTS also uses ANNOTATEMORE (or is it METADATA nowadays?) extension to keep "last seen message in BTS" state in the mailbox's annotations. It then issues a SEARCH SUBJECT "[bug #" command for the new messages and does THREAD command for them to see if they're the bug root, or if they were replies to another message which should be treated as the bug root. When viewing a bug, the bug metadata comes from the annotations. Annotation history could also be kept, possibly as messages in another history mailbox. The messages for a bug can be viewed by issuing a THREAD (REFERENCES) command and showing all the mails that exist under the bug root. So, any volunteers to implement the web part, if I implement the ANNOTATE extension? :) It would actually even be possible to implement multiple frontends. All I need to do is give you access (read-only, or read-write for some) to the bug tracking mailbox, and you can use whatever frontend you wish, even a non-web one!

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[Dovecot] changing the separator
by Marten Lehmann 23 Mar '07

23 Mar '07

Hello, is it possible the change the folder separator from "." to "/"? Users shall be able to have folders like "Junk/aol.com/*". Regards Marten

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[Dovecot] I wrote a managesieve server for Dovecot
by Neale Pickett 22 Mar '07

22 Mar '07

I have written a managesieve server from scratch in Python. I did just enough work to get it working with avelsieve (the squirrelmail plugin), smartsieve, and KDE's sieve kioplugin. It supports the entire Internet draft. Since I didn't have a working sieve server to compare against, I'm not sure if it's 100% compatible with timsieved. Client applications seem to work okay anyway. I wrote it in such a way as to decouple how authentication is carried out and how sieve scripts are actually stored, so you could for instance modify this to work with SASL and Exim. Currently it only has code for PAM and Dovecot's LDA, because I run Postfix :). TLS support is in the code but disabled because I had problems writing a unit test for it. All my connections are from localhost anyway. http://woozle.org/~neale/repos/pysieved if anyone is interested. I haven't looked closely at Stephan Bosch's managesieve server in C but I do want to acknowledge that he has written a C managesieve server that currently exists as a patch to the Dovecot source code. People looking for a managesieve implementation in C are encouraged to try his patch out: http://sinas.rename-it.nl/~sirius/ Neale

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Re: [Dovecot] Replacing qmail + vpopmail with: sendmail + dovecot.
by David Robillard 22 Mar '07

22 Mar '07

> Hi, > I wonder if it posible to replace qmail + vpopmail with sendmail + dovecot? > > The idea is like this: > - use sendmail + milter API to filter spam/virus and deliver the email to > the dovevot MDA (LDA) > - dovecot should save the email to the directory as specified in the > vpopmail DB > - maintain the vpopmail BD (users + passwd) > - use dovecot pop3/imap for the clients > - use sendmail again to receive the email from the pop3/imap users and > deliver the email to the internet as usual. > > Anyone has done this? It is posible in the paper, in the real world? Hi Oliver, We run sendmail + dovecot on FreeBSD for around 3500 users. It runs smooth. We also run two other FreeBSD machines with Sophos PureMessage for Anti-SPAM and Anti-Virus cleanup which is linked via sendmail's milter. You're going to need Procmail to link sendmail and dovecot for local mail delivery to the user's mbox or Maildir, which ever you prefer. We're using Maildir here to serve both IMAP over SSL and POP3 over SSL. If you need any help in the setup of sendmail + procmail + dovecot, just tell me. Of course, if you're more experienced with Postfix, then use it. IMHO it's not as flexible as sendmail. But YMMV. Have fun, David -- David Robillard UNIX systems administrator & Oracle DBA CISSP, RHCE & Sun Certified Security Administrator Montreal: +1 514 966 0122

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[Dovecot] GSSAPI authentication behind HA servers
by Mustafa A. Hashmi 22 Mar '07

22 Mar '07

Hi all, We have 2 mail servers sitting behind linux-HA machines.The mail servers are currently running dovecot 1.0rc2. Looking to enable GSSAPI authentication, I exported krb keytabs for imap/node01.domain@REALM and imap/node02.domain@REALM for both mail servers. However, clients are connecting to mail.domain.com, which results in a mismatch as far as the keytab is concerned (and rightly so). Connections directly to node01 and node02 work fine for gssapi auth. I proceeded to export a key for mail.domain.com into the same keytab for both the nodes, however, I don't think more than a single key is checked for the imap service, and authentication errors continued. Is anybody running something similar? Could you please explain how you have this working on your end? Appreciate any help. Regards, -- Mustafa A. Hashmi mahashmi(a)gmail.com

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[Dovecot] Comments about LDA wiki page
by Magnus Holmgren 22 Mar '07

22 Mar '07

I've just tried out Dovecot LDA. The reason I didn't want to use it before was that I found it unnecessary together with Exim, plus I wanted to use Exim's filtering. But now I wanted to see if can notice any improvement when the indexes are updated on delivery, and I saw that it's possible to use Exim filters and pass the resulting folder with -m. Now, correct me if I'm wrong, but IIUC some corrections, improvements, and comments could be made on http://wiki.dovecot.org/LDA. In the "Site-wide setup" section (and in dovecot.conf) it's suggested that access be restricted to the master socket somehow. The first Exim example ("System-users"), however, requires a world-writable socket. Uncomment "group = mail" and deliver will complain that setgid() fails. In this situation, the "-d $local_part@$domain" is unnecessary because then deliver will use the name of the user it's running as (it should probably have been just "-d $local_part" anyway). However, if deliver is run by root (which is by default impossible under Exim) or setuid root, then a destination user is mandatory. Oh wait, without -d the auth socket isn't used at all, only the HOME environment variable and default_mail_env are. Well, it shouldn't matter much if you're running a standard pam/passwd setup, but with a more complicated non-virtual setup I see only four solutions: Make deliver setuid root, remove root from the compiled-in FIXED_NEVER_USERS list, run deliver as a user/group that has write access to all mailboxes, or make the master socket world-writable. -- Magnus Holmgren holmgren(a)lysator.liu.se (No Cc of list mail needed, thanks)

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Re: [Dovecot] I keep getting password mismatches
by Mark 16 Mar '07

16 Mar '07

i`m still not getting in.. i now have this error:Feb 17 23:48:42 School-Mail dovecot: Dovecot v1.0.rc15 starting upFeb 17 23:49:04 School-Mail dovecot: auth(default): client in: AUTH 1 PLAIN service=IMAP secured lip=127.0.0.1 rip=127.0.0.1 resp=AG1hcmsAbWFyaw==Feb 17 23:49:04 School-Mail dovecot: auth(default): pam(mark,127.0.0.1): pam_authenticate() failed: Authentication failureFeb 17 23:49:05 School-Mail dovecot: imap-login: Disconnected: user=<mark>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, securedFeb 17 23:49:05 School-Mail dovecot: auth(default): client out: FAIL 1 user=markand just to be sure.. here is my dovecot.conf file:## Dovecot configuration file# If you're in a hurry, see http://wiki.dovecot.org/QuickConfiguration# '#' character and everything after it is treated as comments. Extra spaces# and tabs are ignored. If you want to use either of these explicitly, put the# value inside quotes, eg.: key = "# char and trailing whitespace "# Default values are shown for each setting, it's not required to uncomment# any of the lines.# Base directory where to store runtime data.#base_dir = /var/run/dovecot/# Protocols we want to be serving: imap imaps pop3 pop3s# If you only want to use dovecot-auth, you can set this to "none".#protocols = imap imaps pop3 pop3sprotocols = imap pop3# IP or host address where to listen in for connections. It's not currently# possible to specify multiple addresses. "*" listens in all IPv4 interfaces.# "[::]" listens in all IPv6 interfaces, but may also listen in all IPv4# interfaces depending on the operating system.## If you want to specify ports for each service, you will need to configure# these settings inside the protocol imap/pop3 { ... } section, so you can# specify different ports for IMAP/POP3. For example:# protocol imap {# listen = *:10143# ssl_listen = *:10943# ..# }# protocol pop3 {# listen = *:10100# ..# }#listen = [::]listen =# Disable LOGIN command and all other plaintext authentications unless# SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP# matches the local IP (ie. you're connecting from the same computer), the# connection is considered secure and plaintext authentication is allowed.disable_plaintext_auth = no# Should all IMAP and POP3 processes be killed when Dovecot master process# shuts down. Setting this to "no" means that Dovecot can be upgraded without# forcing existing client connections to close (although that could also be# a problem if the upgrade is eg. because of a security fix). This however# means that after master process has died, the client processes can't write# to log files anymore.#shutdown_clients = yes#### Logging### Use this logfile instead of syslog(). /dev/stderr can be used if you want to# use stderr for logging (ONLY /dev/stderr - otherwise it is closed).#log_path =# For informational messages, use this logfile instead of the default#info_log_path =# Prefix for each line written to log file. % codes are in strftime(3)# format.#log_timestamp = "%b %d %H:%M:%S "# Syslog facility to use if you're logging to syslog. Usually if you don't# want to use "mail", you'll use local0..local7. Also other standard# facilities are supported.#syslog_facility = mail#### SSL settings### IP or host address where to listen in for SSL connections. Defaults# to above if not specified.#ssl_listen =ssl_listen =# Disable SSL/TLS support.#ssl_disable = no# PEM encoded X.509 SSL/TLS certificate and private key. They're opened before# dropping root privileges, so keep the key file unreadable by anyone but# root. Included doc/mkcert.sh can be used to easily generate self-signed# certificate, just make sure to update the domains in dovecot-openssl.cnf#ssl_cert_file = /etc/pki/dovecot/certs/dovecot.pem#ssl_key_file = /etc/pki/dovecot/private/dovecot.pem# If key file is password protected, give the password here. Alternatively# give it when starting dovecot with -p parameter.#ssl_key_password =# File containing trusted SSL certificate authorities. Usually not needed.# The CAfile should contain the CA-certificate(s) followed by the matching# CRL(s). CRL checking is new in dovecot .rc1#ssl_ca_file =# Request client to send a certificate.#ssl_verify_client_cert = no# How often to regenerate the SSL parameters file. Generation is quite CPU# intensive operation. The value is in hours, 0 disables regeneration# entirely.#ssl_parameters_regenerate = 168# SSL ciphers to use#ssl_cipher_list = ALL:!LOW# Show protocol level SSL errors.#verbose_ssl = no#### Login processes### Directory where authentication process places authentication UNIX sockets# which login needs to be able to connect to. The sockets are created when# running as root, so you don't have to worry about permissions. Note that# everything in this directory is deleted when Dovecot is started.#login_dir = /var/run/dovecot/login# chroot login process to the login_dir. Only reason not to do this is if you# wish to run the whole Dovecot without roots.# http://wiki.dovecot.org/Rootless#login_chroot = yes# User to use for the login process. Create a completely new user for this,# and don't use it anywhere else. The user must also belong to a group where# only it has access, it's used to control access for authentication process.# Note that this user is NOT used to access mails.# http://wiki.dovecot.org/UserIds#login_user = dovecot# Set max. process size in megabytes. If you don't use# login_process_per_connection you might need to grow this.#login_process_size = 32# Should each login be processed in it's own process (yes), or should one# login process be allowed to process multiple connections (no)? Yes is more# secure, espcially with SSL/TLS enabled. No is faster since there's no need# to create processes all the time.#login_process_per_connection = yes# Number of login processes to keep for listening new connections.#login_processes_count = 3# Maximum number of login processes to create. The listening process count# usually stays at login_processes_count, but when multiple users start logging# in at the same time more extra processes are created. To prevent fork-bombing# we check only once in a second if new processes should be created - if all# of them are used at the time, we double their amount until the limit set by# this setting is reached.#login_max_processes_count = 128# Maximum number of connections allowed per each login process. This setting# is used only if login_process_per_connection=no. Once the limit is reached,# the process notifies master so that it can create a new login process.# You should make sure that the process has at least# 16 + login_max_connections * 2 available file descriptors.#login_max_connections = 256# Greeting message for clients.#login_greeting = Dovecot ready.# Space-separated list of elements we want to log. The elements which have# a non-empty variable value are joined together to form a comma-separated# string.#login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c# Login log format. %$ contains login_log_format_elements string, %s contains# the data we want to log.#login_log_format = %$: %s#### Mailbox locations and namespaces### Location for users' mailboxes. This is the same as the old default_mail_env# setting. The default is empty, which means that Dovecot tries to find the# mailboxes automatically. This won't work if the user doesn't have any mail# yet, so you should explicitly tell Dovecot the full location.## If you're using mbox, giving a path to the INBOX file (eg. /var/mail/%u)# isn't enough. You'll also need to tell Dovecot where the other mailboxes are# and where Dovecot can place its index files. This is called the "root mail# directory", and it must be the first path given in the mail_location setting.## There are a few special variables you can use, eg.:## %u - username# %n - user part in user@domain, same as %u if there's no domain# %d - domain part in user@domain, empty if there's no domain# %h - home directory## See doc/variables.txt for full list. Some examples:## mail_location = maildir:~/Maildir# mail_location = mbox:~/mail:INBOX=/var/mail/%u# mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n## http://wiki.dovecot.org/MailLocation##mail_location =# If you need to set multiple mailbox locations or want to change default# namespace settings, you can do it by defining namespace sections:## You can have private, shared and public namespaces. The only difference# between them is how Dovecot announces them to client via NAMESPACE# extension. Shared namespaces are meant for user-owned mailboxes which are# shared to other users, while public namespaces are for more globally# accessible mailboxes.## REMEMBER: If you add any namespaces, the default namespace must be added# explicitly, ie. mail_location does nothing unless you have a namespace# without a location setting. Default namespace is simply done by having a# namespace with empty prefix.#namespace private { # Hierarchy separator to use. You should use the same separator for all # namespaces or some clients get confused. '/' is usually a good one. # The default however depends on the underlying mail storage format. #separator = # Prefix required to access this namespace. This needs to be different for # all namespaces. For example "Public/". #prefix = # Physical location of the mailbox. This is in same format as # mail_location, which is also the default for it. #location = # There can be only one INBOX, and this setting defines which namespace # has it. #inbox = yes # If namespace is hidden, it's not advertised to clients via NAMESPACE # extension or shown in LIST replies. This is mostly useful when converting # from another server with different namespaces which you want to depricate # but still keep working. For example you can create hidden namespaces with # prefixes "~/mail/", "~%u/mail/" and "mail/". #hidden = yes#}# Grant access to these extra groups for mail processes. Typical use would be# to give "mail" group write access to /var/mail to be able to create dotlocks.#mail_extra_groups =# Allow full filesystem access to clients. There's no access checks other than# what the operating system does for the active UID/GID. It works with both# maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/# or ~user/.#mail_full_filesystem_access = no#### Mail processes### Enable mail process debugging. This can help you figure out why Dovecot# isn't finding your mails.#mail_debug = no# Log prefix for mail processes. See doc/variables.txt for list of possible# variables you can use.#mail_log_prefix = "%Us(%u): "# Use mmap() instead of read() to read mail files. read() seems to be a bit# faster with my Linux/x86 and it's better with NFS, so that's the default.# Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped = yes.#mail_read_mmaped = no# Don't use mmap() at all. This is required if you store indexes to shared# filesystems (NFS or clustered filesystem).#mmap_disable = no# Don't write() to mmaped files. This is required for some operating systems# which use separate caches for them, such as OpenBSD.#mmap_no_write = no# Locking method for index files. Alternatives are fcntl, flock and dotlock.# Dotlocking uses some tricks which may create more disk I/O than other locking# methods. NOTE: If you use NFS, remember to change also mmap_disable setting!#lock_method = fcntl# Drop all privileges before exec()ing the mail process. This is mostly# meant for debugging, otherwise you don't get core dumps. It could be a small# security risk if you use single UID for multiple users, as the users could# ptrace() each others processes then.#mail_drop_priv_before_exec = no# Show more verbose process titles (in ps). Currently shows user name and# IP address. Useful for seeing who are actually using the IMAP processes# (eg. shared mailboxes or if same uid is used for multiple accounts).#verbose_proctitle = no# Valid UID range for users, defaults to 500 and above. This is mostly# to make sure that users can't log in as daemons or other system users.# Note that denying root logins is hardcoded to dovecot binary and can't# be done even if first_valid_uid is set to 0.#first_valid_uid = 500#last_valid_uid = 0# Valid GID range for users, defaults to non-root/wheel. Users having# non-valid GID as primary group ID aren't allowed to log in. If user# belongs to supplementary groups with non-valid GIDs, those groups are# not set.#first_valid_gid = 1#last_valid_gid = 0# Maximum number of running mail processes. When this limit is reached,# new users aren't allowed to log in.#max_mail_processes = 1024# Set max. process size in megabytes. Most of the memory goes to mmap()ing# files, so it shouldn't harm much even if this limit is set pretty high.#mail_process_size = 256# Maximum allowed length for mail keyword name. It's only forced when trying# to create new keywords.#mail_max_keyword_length = 50# Default umask to use for mail files and directories.#umask = 0077# ':' separated list of directories under which chrooting is allowed for mail# processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too).# This setting doesn't affect login_chroot or auth_chroot variables.# WARNING: Never add directories here which local users can modify, that# may lead to root exploit. Usually this should be done only if you don't# allow shell access for users. See doc/configuration.txt for more information.#valid_chroot_dirs =# Default chroot directory for mail processes. This can be overridden for# specific users in user database by giving /./ in user's home directory# (eg. /home/./user chroots into /home). Note that usually there is no real# need to do chrooting, Dovecot doesn't allow users to access files outside# their mail directory anyway.#mail_chroot =#### Mailbox handling optimizations### Space-separated list of fields to initially save into cache file. Currently# these fields are allowed:## flags, date.sent, date.received, size.virtual, size.physical# mime.parts, imap.body, imap.bodystructure## Different IMAP clients work in different ways, so they benefit from# different cached fields. Some do not benefit from them at all. Caching more# than necessary generates useless disk I/O, so you don't want to do that# either.## Dovecot attempts to automatically figure out what client wants and it keeps# only that. However the first few times a mailbox is opened, Dovecot hasn't# yet figured out what client needs, so it may not perform optimally. If you# know what fields the majority of your clients need, it may be useful to set# these fields by hand. If client doesn't actually use them, Dovecot will# eventually drop them.## Usually you should just leave this field alone. The potential benefits are# typically unnoticeable.#mail_cache_fields =# Space-separated list of fields that Dovecot should never save to cache file.# Useful if you want to save disk space at the cost of more I/O when the fields# needed.#mail_never_cache_fields =# The minimum number of mails in a mailbox before updates are done to cache# file. This allows optimizing Dovecot's behavior to do less disk writes at# the cost of more disk reads.#mail_cache_min_mail_count = 0# When IDLE command is running, mailbox is checked once in a while to see if# there are any new mails or other changes. This setting defines the minimum# time to wait between those checks. Dovecot is however able to use dnotify# and inotify with Linux to reply immediately after the change occurs.#mailbox_idle_check_interval = 30# Save mails with CR+LF instead of plain LF. This makes sending those mails# take less CPU, especially with sendfile() syscall with Linux and FreeBSD.# But it also creates a bit more disk I/O which may just make it slower.# Also note that if other software reads the mboxes/maildirs, they may handle# the extra CRs wrong and cause problems.#mail_save_crlf = no#### Maildir-specific settings### By default LIST command returns all entries in maildir beginning with dot.# Enabling this option makes Dovecot return only entries which are directories.# This is done by stat()ing each entry, so it causes more disk I/O.# (For systems setting struct dirent->d_type, this check is free and it's# done always regardless of this setting)#maildir_stat_dirs = no# Copy mail to another folders using hard links. This is much faster than# actually copying the file. This is problematic only if something modifies# the mail in one folder but doesn't want it modified in the others. I don't# know any MUA which would modify mail files directly. IMAP protocol also# requires that the mails don't change, so it would be problematic in any case.# If you care about performance, enable it.#maildir_copy_with_hardlinks = no#### mbox-specific settings### Which locking methods to use for locking mbox. There are four available:# dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe# solution. If you want to use /var/mail/ like directory, the users# will need write access to that directory.# fcntl : Use this if possible. Works with NFS too if lockd is used.# flock : May not exist in all systems. Doesn't work with NFS.# lockf : May not exist in all systems. Doesn't work with NFS.## You can use multiple locking methods; if you do the order they're declared# in is important to avoid deadlocks if other MTAs/MUAs are using multiple# locking methods as well. Some operating systems don't allow using some of# them simultaneously.#mbox_read_locks = fcntl#mbox_write_locks = fcntl# Maximum time in seconds to wait for lock (all of them) before aborting.#mbox_lock_timeout = 300# If dotlock exists but the mailbox isn't modified in any way, override the# lock file after this many seconds.#mbox_dotlock_change_timeout = 120# When mbox changes unexpectedly we have to fully read it to find out what# changed. If the mbox is large this can take a long time. Since the change# is usually just a newly appended mail, it'd be faster to simply read the# new mails. If this setting is enabled, Dovecot does this but still safely# fallbacks to re-reading the whole mbox file whenever something in mbox isn't# how it's expected to be. The only real downside to this setting is that if# some other MUA changes message flags, Dovecot doesn't notice it immediately.# Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK# commands.#mbox_dirty_syncs = yes# Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,# EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.#mbox_very_dirty_syncs = no# Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK# commands and when closing the mailbox). This is especially useful for POP3# where clients often delete all mails. The downside is that our changes# aren't immediately visible to other MUAs.#mbox_lazy_writes = yes# If mbox size is smaller than this (in kilobytes), don't write index files.# If an index file already exists it's still read, just not updated.#mbox_min_index_size = 0#### dbox-specific settings### Maximum dbox file size in kilobytes until it's rotated.#dbox_rotate_size = 2048# Minimum dbox file size in kilobytes before it's rotated# (overrides dbox_rotate_days)#dbox_rotate_min_size = 16# Maximum dbox file age in days until it's rotated. Day always begins from# midnight, so 1 = today, 2 = yesterday, etc. 0 = check disabled.#dbox_rotate_days = 0#### IMAP specific settings##protocol imap { # Login executable location. #login_executable = /usr/libexec/dovecot/imap-login # IMAP executable location. Changing this allows you to execute other # binaries before the imap process is executed. # # This would write rawlogs into ~/dovecot.rawlog/ directory: # mail_executable = /usr/libexec/dovecot/rawlog /usr/libexec/dovecot/imap # # This would attach gdb into the imap process and write backtraces into # /tmp/gdbhelper.* files: # mail_executable = /usr/libexec/dovecot/gdbhelper /usr/libexec/dovecot/imap # #mail_executable = /usr/libexec/dovecot/imap # Maximum IMAP command line length in bytes. Some clients generate very long # command lines with huge mailboxes, so you may need to raise this if you get # "Too long argument" or "IMAP command line too large" errors often. #imap_max_line_length = 65536 # Support for dynamically loadable plugins. mail_plugins is a space separated # list of plugins to load. #mail_plugins = #mail_plugin_dir = /usr/lib/dovecot/imap # Send IMAP capabilities in greeting message. This makes it unnecessary for # clients to request it with CAPABILITY command, so it saves one round-trip. # Many clients however don't understand it and ask the CAPABILITY anyway. #login_greeting_capability = no # Override the IMAP CAPABILITY response. #imap_capability = # Workarounds for various client bugs: # delay-newmail: # Send EXISTS/RECENT new mail notifications only when replying to NOOP # and CHECK commands. Some clients ignore them otherwise, for example # OSX Mail. Outlook Express breaks more badly though, without this it # may show user "Message no longer in server" errors. Note that OE6 still # breaks even with this workaround if synchronization is set to # "Headers Only". # outlook-idle: # Outlook and Outlook Express never abort IDLE command, so if no mail # arrives in half a hour, Dovecot closes the connection. This is still # fine, except Outlook doesn't connect back so you don't see if new mail # arrives. # netscape-eoh: # Netscape 4.x breaks if message headers don't end with the empty "end of # headers" line. Normally all messages have this, but setting this # workaround makes sure that Netscape never breaks by adding the line if # it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..] # commands. Note that RFC says this shouldn't be done. # tb-extra-mailbox-sep: # With mbox storage a mailbox can contain either mails or submailboxes, # but not both. Thunderbird separates these two by forcing server to # accept '/' suffix in mailbox names in subscriptions list. # The list is space-separated. #imap_client_workarounds = outlook-idle}#### POP3 specific settings##protocol pop3 { # Login executable location. #login_executable = /usr/libexec/dovecot/pop3-login # POP3 executable location. See IMAP's mail_executable above for examples # how this could be changed. #mail_executable = /usr/libexec/dovecot/pop3 # Don't try to set mails non-recent or seen with POP3 sessions. This is # mostly intended to reduce disk I/O. With maildir it doesn't move files # from new/ to cur/, with mbox it doesn't write Status-header. #pop3_no_flag_updates = no # Support LAST command which exists in old POP3 specs, but has been removed # from new ones. Some clients still wish to use this though. Enabling this # makes RSET command clear all \Seen flags from messages. #pop3_enable_last = no # If mail has X-UIDL header, use it as the mail's UIDL. #pop3_reuse_xuidl = no # Keep the mailbox locked for the entire POP3 session. #pop3_lock_session = no # POP3 UIDL format to use. You can use following variables: # # %v - Mailbox UIDVALIDITY # %u - Mail UID # %m - MD5 sum of the mailbox headers in hex (mbox only) # %f - filename (maildir only) # # If you want UIDL compatibility with other POP3 servers, use: # UW's ipop3d : %08Xv%08Xu # Courier version 0 : %f # Courier version 1 : %u # Courier version 2 : %v-%u # Cyrus (<= 2.1.3) : %u # Cyrus (>= 2.1.4) : %v.%u # Older Dovecots : %v.%u # tpop3d : %Mf # # Note that Outlook 2003 seems to have problems with %v.%u format which was # Dovecot's default, so if you're building a new server it would be a good # idea to change this. %08Xu%08Xv should be pretty fail-safe. # # NOTE: Nowadays this is required to be set explicitly, since the old # default was bad but it couldn't be changed without breaking existing # installations. %08Xu%08Xv will be the new default, so use it for new # installations. # #pop3_uidl_format = %08Xu%08Xv # POP3 logout format string: # %t - number of TOP commands # %p - number of bytes sent to client as a result of TOP command # %r - number of RETR commands # %b - number of bytes sent to client as a result of RETR command # %d - number of deleted messages # %m - number of messages (before deletion) # %s - mailbox size in bytes (before deletion) #pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s # Support for dynamically loadable plugins. mail_plugins is a space separated # list of plugins to load. #mail_plugins = #mail_plugin_dir = /usr/lib/dovecot/pop3 # Workarounds for various client bugs: # outlook-no-nuls: # Outlook and Outlook Express hang if mails contain NUL characters. # This setting replaces them with 0x80 character. # oe-ns-eoh: # Outlook Express and Netscape Mail breaks if end of headers-line is # missing. This option simply sends it if it's missing. # The list is space-separated. #pop3_client_workarounds =}#### LDA specific settings##protocol lda { # Address to use when sending rejection mails. postmaster_address = postmaster(a)example.com # Hostname to use in various parts of sent mails, eg. in Message-Id. # Default is the system's real hostname. #hostname = # Support for dynamically loadable plugins. mail_plugins is a space separated # list of plugins to load. #mail_plugins = #mail_plugin_dir = /usr/lib/dovecot/lda # Binary to use for sending mails. #sendmail_path = /usr/lib/sendmail # UNIX socket path to master authentication server to find users. #auth_socket_path = /var/run/dovecot/auth-master}#### Authentication processes### Executable location#auth_executable = /usr/libexec/dovecot/dovecot-auth# Set max. process size in megabytes.#auth_process_size = 256# Authentication cache size in kilobytes. 0 means it's disabled.# Note that bsdauth, PAM and vpopmail require cache_key to be set for caching# to be used. Also note that currently auth cache doesn't work very well if# you're using multiple passdbs with same usernames in them.#auth_cache_size = 0# Time to live in seconds for cached data. After this many seconds the cached# record is no longer used, *except* if the main database lookup returns# internal failure. We also try to handle password changes automatically: If# user's previous authentication was successful, but this one wasn't, the# cache isn't used. For now this works only with plaintext authentication.#auth_cache_ttl = 3600# Space separated list of realms for SASL authentication mechanisms that need# them. You can leave it empty if you don't want to support multiple realms.# Many clients simply use the first one listed here, so keep the default realm# first.#auth_realms =# Default realm/domain to use if none was specified. This is used for both# SASL realms and appending @domain to username in plaintext logins.#auth_default_realm =# List of allowed characters in username. If the user-given username contains# a character not listed in here, the login automatically fails. This is just# an extra check to make sure user can't exploit any potential quote escaping# vulnerabilities with SQL/LDAP databases. If you want to allow all characters,# set this value to empty.#auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@# Username character translations before it's looked up from databases. The# value contains series of from -> to characters. For example "#@/@" means# that '#' and '/' characters are translated to '@'.#auth_username_translation =# Username formatting before it's looked up from databases. You can use# the standard variables here, eg. %Lu would lowercase the username, %n would# drop away the domain if it was given, or "%n-AT-%d" would change the '@' into# "-AT-". This translation is done after auth_username_translation changes.#auth_username_format =# If you want to allow master users to log in by specifying the master# username within the normal username string (ie. not using SASL mechanism's# support for it), you can specify the separator character here. The format# is then <username><separator><master username>. UW-IMAP uses "*" as the# separator, so that could be a good choice.#auth_master_user_separator =# Username to use for users logging in with ANONYMOUS SASL mechanism#auth_anonymous_username = anonymous# More verbose logging. Useful for figuring out why authentication isn't# working.auth_verbose = yes# Even more verbose logging for debugging purposes. Shows for example SQL# queries.auth_debug = yes# In case of password mismatches, log the passwords and used scheme so the# problem can be debugged. Requires auth_debug=yes to be set.auth_debug_passwords = yes# Maximum number of dovecot-auth worker processes. They're used to execute# blocking passdb and userdb queries (eg. MySQL and PAM). They're# automatically created and destroyed as needed.#auth_worker_max_count = 30# Kerberos keytab to use for the GSSAPI mechanism. Will use the system# default (usually /etc/krb5.keytab) if not specified.#auth_krb5_keytab =auth default { # Space separated list of wanted authentication mechanisms: # plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi mechanisms = plain # # Password database is used to verify user's password (and nothing more). # You can have multiple passdbs and userdbs. This is useful if you want to # allow both system users (/etc/passwd) and virtual users to login without # duplicating the system users into virtual database. # # http://wiki.dovecot.org/PasswordDatabase # # By adding master=yes setting inside a passdb you make the passdb a list # of "master users", who can log in as anyone else. Unless you're using PAM, # you probably still want the destination user to be looked up from passdb # that it really exists. This can be done by adding pass=yes setting to the # master passdb. # # http://wiki.dovecot.org/MasterPassword # Users can be temporarily disabled by adding a passdb with deny=yes. # If the user is found from that database, authentication will fail. # The deny passdb should always be specified before others, so it gets # checked first. Here's an example: #passdb passwd-file { # File contains a list of usernames, one per line #args = /etc/dovecot.deny #deny = yes #} # PAM authentication. Preferred nowadays by most systems. # Note that PAM can only be used to verify if user's password is correct, # so it can't be used as userdb. If you don't want to use a separate user # database (passwd usually), you can use static userdb. # REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM # authentication to actually work. # http://wiki.dovecot.org/PasswordDatabase/PAMpassdb pam { # use /etc/pam.d/imap and /etc/pam.d/pop3 args = *} # /etc/passwd or similar, using getpwnam() # In many systems nowadays this uses Name Service Switch, which is # configured in /etc/nsswitch.conf. # http://wiki.dovecot.org/AuthDatabase/Passwd #passdb passwd { #} # /etc/shadow or similiar, using getspnam(). Deprecated by PAM nowadays. # http://wiki.dovecot.org/PasswordDatabase/Shadow #passdb shadow { #} # PAM-like authentication for OpenBSD. # http://wiki.dovecot.org/PasswordDatabase/BSDAuth #passdb bsdauth { # [cache_key=<key>] - See cache_key in PAM for explanation. #args = #} # passwd-like file with specified location # http://wiki.dovecot.org/AuthDatabase/PasswdFile #passdb passwd-file { # Path for passwd-file #args = #} # checkpassword executable authentication # NOTE: You will probably want to use "userdb prefetch" with this. # http://wiki.dovecot.org/PasswordDatabase/CheckPassword #passdb checkpassword { # Path for checkpassword binary #args = #} # SQL database # http://wiki.dovecot.org/AuthDatabase/SQL #passdb sql { # Path for SQL configuration file, see doc/dovecot-sql.conf for example #args = #} # LDAP database # http://wiki.dovecot.org/AuthDatabase/LDAP #passdb ldap { # Path for LDAP configuration file, see doc/dovecot-ldap.conf for example #args = #} # vpopmail authentication # http://wiki.dovecot.org/AuthDatabase/VPopMail #passdb vpopmail { # [cache_key=<key>] - See cache_key in PAM for explanation. #args = #} # # User database specifies where mails are located and what user/group IDs # own them. For single-UID configuration use "static". # # http://wiki.dovecot.org/UserDatabase # # /etc/passwd or similar, using getpwnam() # In many systems nowadays this uses Name Service Switch, which is # configured in /etc/nsswitch.conf. WARNING: nss_ldap is known to be broken # with Dovecot. Don't use it, or users might log in as each others! # http://wiki.dovecot.org/AuthDatabase/Passwd userdb passwd { } # passwd-like file with specified location # http://wiki.dovecot.org/AuthDatabase/PasswdFile #userdb passwd-file { # Path for passwd-file #args = #} # static settings generated from template # http://wiki.dovecot.org/UserDatabase/Static #userdb static { # Template for the fields. Can return anything a userdb could normally # return. For example: # # args = uid=500 gid=500 home=/var/mail/%u # #args = #} # SQL database # http://wiki.dovecot.org/AuthDatabase/SQL #userdb sql { # Path for SQL configuration file, see doc/dovecot-sql.conf for example #args = #} # LDAP database # http://wiki.dovecot.org/AuthDatabase/LDAP #userdb ldap { # Path for LDAP configuration file, see doc/dovecot-ldap.conf for example #args = #} # vpopmail # http://wiki.dovecot.org/AuthDatabase/VPopMail #userdb vpopmail { #} # "prefetch" user database means that the passdb already provided the # needed information and there's no need to do a separate userdb lookup. # This can be made to work with SQL and LDAP databases, see their example # configuration files for more information how to do it. # http://wiki.dovecot.org/UserDatabase/Prefetch #userdb prefetch { #} # User to use for the process. This user needs access to only user and # password databases, nothing else. Only shadow and pam authentication # requires roots, so use something else if possible. Note that passwd # That user is specified by userdb above. user = root # Directory where to chroot the process. Most authentication backends don't # work if this is set, and there's no point chrooting if auth_user is root. # Note that valid_chroot_dirs isn't needed to use this setting. #chroot = # Number of authentication processes to create #count = 1 # Require a valid SSL client certificate or the authentication fails. #ssl_require_client_cert = no # Take the username from client's SSL certificate, using # X509_NAME_get_text_by_NID() which returns the subject's DN's # CommonName. #ssl_username_from_cert = no # It's possible to export the authentication interface to other programs: #socket listen { #master { # Master socket is typically used to give Dovecot's local delivery # agent access to userdb so it can find mailbox locations. It can # however also be used to disturb regular user authentications. # WARNING: Giving untrusted users access to master socket may be a # security risk, don't give too wide permissions to it! #path = /var/run/dovecot/auth-master #mode = 0600 # Default user/group is the one who started dovecot-auth (root) #user = #group = #} #client { # The client socket is generally safe to export to everyone. Typical use # is to export it to your SMTP server so it can do SMTP AUTH lookups # using it. #path = /var/run/dovecot/auth-client #mode = 0660 #} #}}# If you wish to use another authentication server than dovecot-auth, you can# use connect sockets. They assumed to be already running, Dovecot's master# process only tries to connect to them. They don't need any other settings# than the path for the master socket, as the configuration is done elsewhere.# Note that the client sockets must exist in the login_dir.#auth external {# socket connect {# master {# path = /var/run/dovecot/auth-master# }# }#}#### Dictionary server settings### Dictionary can be used by some plugins to store key=value lists.# Currently this is only used by dict quota backend. The dictionary can be# used either directly or though a dictionary server. The following dict block# maps dictionary names to URIs when the server is used. These can then be# referenced using URIs in format "proxy:<name>".dict { #quota = mysql:/etc/dovecot-dict-quota.conf}#### Plugin settings##plugin { # Here you can give some extra environment variables to mail processes. # This is mostly meant for passing parameters to plugins. %variable # expansion is done for all values. # Quota plugin. Multiple backends are supported: # dirsize: Find and sum all the files found from mail directory # dict: Keep quota stored in dictionary (eg. SQL) # maildir: Maildir++ quota # fs: Read-only support for filesystem quota #quota = maildir # ACL plugin. vfile backend reads ACLs from "dovecot-acl" file from maildir # directory. You can also optionally give a global ACL directory path where # ACLs are applied to all users' mailboxes. The global ACL directory contains # one file for each mailbox, eg. INBOX or sub.mailbox. #acl = vfile:/etc/dovecot-acls # Convert plugin. If set, specifies the source storage path which is # converted to destination storage (mail_location). #convert_mail = mbox:%h/mail # Trash plugin. When saving a message would make user go over quota, this # plugin automatically deletes the oldest mails from configured mailboxes # until the message can be saved within quota limits. The configuration file # is a text file where each line is in format: <priority> <mailbox name> # Mails are first deleted in lowest -> highest priority number order #trash = /etc/dovecot-trash.conf}----------------and that is my dovecot.conf that comes with my dovecot installation automatically when i type: yum install dovecotif anyone is willing to share his dovecot.conf file.. ?? (a working one ofcause ;))Thanx.Mark. _________________________________________________________________ Probeer Live.com: jouw leven online met nieuws, sport, weer en nog veel meer. http://www.live.com/getstarted

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Re: [Dovecot] rc22 segv when over quota
by Steffen Kaiser 16 Mar '07

16 Mar '07

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 20 Feb 2007, Steffen Kaiser wrote: I have rebuilt rc23 to use "poll" instead of epoll, the same problem: warning: Can't read pathname for load map: Input/output error. Reading symbols from /lib/tls/i686/cmov/libdl.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libdl.so.2 Reading symbols from /lib/tls/i686/cmov/libc.so.6...done. Loaded symbols for /lib/tls/i686/cmov/libc.so.6 Reading symbols from /lib/ld-linux.so.2...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /usr/local/lib/dovecot/imap/lib10_quota_plugin.so...done. Loaded symbols for /usr/local/lib/dovecot/imap/lib10_quota_plugin.so Reading symbols from /usr/local/lib/dovecot/imap/lib11_imap_quota_plugin.so...done. Loaded symbols for /usr/local/lib/dovecot/imap/lib11_imap_quota_plugin.so Core was generated by `imap [dvtest 10.20.10.63]'. Program terminated with signal 11, Segmentation fault. #0 mailbox_save_continue (ctx=0x80df574) at mail-storage.c:530 530 return ctx->transaction->box->v.save_continue(ctx); (gdb) bt full #0 mailbox_save_continue (ctx=0x80df574) at mail-storage.c:530 No locals. #1 0x08057193 in client_input (context=0x80df530) at cmd-append.c:67 client = (struct client *) 0x32c cmd = (struct client_command_context *) 0x80e27c0 #2 0x080ba522 in io_loop_handler_run (ioloop=0x80dd9b0) at ioloop-poll.c:199 ctx = (struct ioloop_handler_context *) 0x80dd9d8 pollfd = <value optimized out> tv = {tv_sec = 4, tv_usec = 762810} io = (struct io *) 0x80df610 t_id = 2 msecs = <value optimized out> ret = 135132464 call = <value optimized out> #3 0x080b9868 in io_loop_run (ioloop=0x80dd9b0) at ioloop.c:284 No locals. #4 0x08063910 in main (argc=Cannot access memory at address 0x8d4 ) at main.c:285 No locals. - -- Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iQEVAwUBRdr7NS9SORjhbDpvAQKXQQf/VHx/LEaC5zvz3C17iPuCSjro1Q9jznw2 GQA3FStiWhP3NsckSSQ+RxB8ih+lf+A8o2+nhF+pJ7N6qcBK3BVkum+WjQW5ddDv IEiAeo+dtFaP+7sO+qJeuq4ImXpiMDGpUVRt+PJYC1cAxWx+HYQ8im5UXEP4eTz7 uMu7MAX9vjwsWHmrfKMJf/36VQpTajMsfrfYbbTPPva++kuuNI33RIDvCeOsSmVF Vu38mRzP+wvwi/4YRV6UciVfrXV7sBl9Tk3oJjdEkn3gbxWPMfBYENxNRhAsj158 m+Zqz/bTJuThWlUFFM6uM/HDNrO39N3oWcHAJb7+zt8ULVMbD2WuVA== =9Ba1 -----END PGP SIGNATURE-----

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Re: [Dovecot] imap-login (proxy) Connection queue full
by Bill Boebel 14 Mar '07

14 Mar '07

On Thu, August 10, 2006 5:22 pm, Timo Sirainen <tss(a)iki.fi> said: >> Aug 10 16:23:34 director5 dovecot: imap-login: Disconnected: Connection queue >> full: >> >> I am seeing this logged several times per minute. From netstat, the server has >> 650 proxied IMAP connections and 450 proxied IMAPS connections, there are >> currently 10 imap-login processes running, and using the following config: > > I did some changes to CVS which hopefully should fix this? It is still disconnecting with "Connection queue full", although less frequently. Testing with about 315 IMAP connections right now and same config as earlier today, so it should never hit this condition, right? The weird thing is sometimes when I am testing via telnet, my session encounters this condition and disconnects within the first 5 seconds. It does this with and without these patches. Bill

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[Dovecot] FreeBSD 6.1-RELEASE/kqueue high CPU load
by Taras Savchuk 11 Mar '07

11 Mar '07

Hi to ALL! I have dovecot-1.0r7 installed on FreeBSD 6.1, using kqueue and Maildir (<20 mailboxes, < 0,5 Gb size). Periodically CPU load of imap processes increasing up to 60-80%. Is it normall behavior or not? May be somebody had such kind of problems? -- С уважением, Савчук Тарас ООО "Элантек" : Аутсорсинг ИТ, WEB-разработка +7 (495) 589 68 81 +7 (926) 575 22 11 http://www.elantech.ru info(a)elantech.ru

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