August 2004 - dovecot

[Dovecot] Multiple dovecot processes stepping on each other
by Peter Hessler 23 Aug '04

23 Aug '04

I have two instances of dovecot running, one for v6 and one for v4 connections. The only differences in the config files are: --- /etc/dovecot-ip6.conf Wed Aug 18 11:15:43 2004 +++ /etc/dovecot-ip4.conf Wed Aug 18 11:09:17 2004 @@ -10,7 +10,7 @@ # *** NOTE *** Some values HAVE been changed for OpenBSD use. # Base directory where to store runtime data. -base_dir = /var/dovecot-v6/ +base_dir = /var/dovecot-v4/ # Protocols we want to be serving: # imap imaps pop3 pop3s @@ -… [View More]

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[Dovecot] Dovecot stop accepting command When reading disk quota (soft)
by Chan Min Wai 23 Aug '04

23 Aug '04

Hello all, I've face some problem here and I think it should be the way. 1) I'm running Dovecot version 0.99.10.4 (fc1 release) on RH9 2) One of the users have reach the soft disk quota limits 3) Dovecot stop the users from deleting email. What I think was, dovecot should let the user continue to use the services until it reach the hard limits, but pop up message each and every time ;). Anyone have that problem before? Thank You Chan Min Wai

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[Dovecot] Sent, Drafts, Trash folders
by Jason M. Wilde 23 Aug '04

23 Aug '04

I am hosting imap mail for a new affiliate and am offering webmail via squirrelmail as well. Squirrelmail created INBOX.Sent, INBOX.Trash, etc by default and I would like to use these folders for my Dovecot imap users. I am using the mbox format, Postfix and users retrieve mail via the Outlook client remotely in addition to webmail access. Thank you for any help. Jason

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[Dovecot] What about saving your INBOX at ~/mbox ?
by Nico Kadel-Garcia 23 Aug '04

23 Aug '04

Hi, folks. I'm testing out RedHat's "Fedora Core 2" release, which has switched from the old WashU imapd to dovecot-0.99.10. Overall, this looks like a really, really good move on their part: it looks like a very sweet little tool without some of the ingrained idiocy of Mark Crispin insisting that every home directory consist of nothing but mbox files and allowing you to use a configurable subdirectory by default, ~/mail. Cool. There is one feature of the old WashU imapd that I miss, though. … [View More]

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[Dovecot] Is 1.0-test stabilising?
by Curtis Maloney 23 Aug '04

23 Aug '04

Has Timo backed off work, and been busy with something else, or has 1.0 really stabilised that much? Seems to me just a couple of weeks ago we were seeing a new test release every few days... now there's been nothing all month... I'm hoping it's ready for release... but if it's just that Timo's busy, well, I can understand that. We're about to receive some new servers, and I hope to migrate from 0.99 to 1.0 as we migrate to the new machines. -- Curtis Maloney

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RE: [Dovecot] Unusual behaviour
by Mark Lidstone 20 Aug '04

20 Aug '04

I thought that Dovecot was supposed to handle that kind of thing? Reading from the website: "Any kind of crash is considered as bug and will be fixed - even if it happens only by deliberately poking the index files." I've done it in the past by just creating the bare folders - they appear in the IMAP folder list then when they're used Dovecot seems to create the sub folders anyway. The issue I'm asking about here is, should the error message say "Internal Error [date time]" rather than … [View More]

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[Dovecot] Unusual behaviour
by Mark Lidstone 20 Aug '04

20 Aug '04

Hi, I've just noticed something strange in dovecot 0.99.10.5. I created some IMAP folders from the command line (mkdir .INBOX.Folder1) as a different user to the owner of the mailbox. Obviously when I tried to view them via IMAP I got an error message, but the message to the client was "internal error[date time]" where date and time appeared to be the current date and time. Is this correct behaviour? Dovecot was running on FC2, and the client was Mozilla Thunderbird under Windows. Mark … [View More]

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[Dovecot] Question: email system architecture
by Gland Vador 18 Aug '04

18 Aug '04

Hi, I have a question about how to implement a mail system, but I don't know where to ask. Until now, I have a mail system who receive mail by postfix and transport it through procmail to the /var/spool/mail/username mailbox. From here it is retrieved through dovecot (POP3). Now I have two more users, I want to implement a IMAP server, and also provide a webmail (squirrelmail) interface. And in order to filter spam, I want to install spamassassin. Until now it was thunderbird who made … [View More]

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[Dovecot] We couldn't drop root group privileges.
by Greg M 16 Aug '04

16 Aug '04

Hello all, This is my first post to this list. I have tried finding this answer online but while it seems that there are some people out there asking, I cant seem to get an answer to it. I have installed Dovecot some many month ago, and just recently I have been getting an error while trying to log into one of my accounts that I used all the time. The error that comes up is pop3: We couldn't drop root group privileges I have seen where someone else has asked this same question, but … [View More]

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[Dovecot] Imap process killed
by Yann Rouillard 16 Aug '04

16 Aug '04

Hi, I get the following message each time I try to access a mailbox. dovecot: [ID 684838 mail.error] child 27041 (imap) killed with signal 11 Using dovecot 1.0-test32 under Solaris 9. Using truss I get the following lines: 27041: read(0, " 2 s e l e c t " I N".., 4096) = 18 27041: open64("/var/mail/toto", O_RDWR|O_CREAT|O_EXCL, 0660) Err#17 EEXIST 27041: time() = 1092672589 27041: open64("", O_RDWR) Err#14 … [View More]EFAULT 27041: Incurred fault #6, FLTBOUNDS %pc = 0xFF1B347C 27041: siginfo: SIGSEGV SEGV_MAPERR addr=0x00000000 27041: Received signal #11, SIGSEGV [default] 27041: siginfo: SIGSEGV SEGV_MAPERR addr=0x00000000 I attached the complete result of the truss command and my configuration file. Any idea what is the problem ? Cheers, Yann ## Dovecot 1.0 configuration file # '#' 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 after each value, it's not required to uncomment # any of the lines. Exception to this are paths, they're just examples # with real defaults being based on configure options. The paths listed here # are for configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var # --with-ssldir=/etc/ssl # Base directory where to store runtime data. base_dir = /var/run/dovecot/ # Protocols we want to be serving: # imap imaps pop3 pop3s protocols = imap # 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. You can specify ports with # "host:port", although with multiple protocols you probably want to move this # setting inside protocol imap/pop3 { ... } section, so you can specify # different ports for IMAP/POP3. #listen = * # IP or host address where to listen in for SSL connections. Defaults # to above if not specified. #ssl_listen = # Disable SSL/TLS support. ssl_disable = yes # 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 = /usr/local/public/ssl/certs/imapd.pem ssl_key_file = /usr/local/public/ssl/certs/imapd.pem # File containing trusted SSL certificate authorities. Usually not needed. #ssl_ca_file = # Request client to send a certificate. #ssl_verify_client_cert = no # SSL parameter file. Master process generates this file for login processes. # It contains Diffie Hellman and RSA parameters. #ssl_parameters_file = /var/run/dovecot/ssl-parameters.dat # 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 = 24 # SSL ciphers to use #ssl_cipher_list = all:!low # Disable LOGIN command and all other plaintext authentications unless # SSL/TLS is used (LOGINDISABLED capability). Note that 127.*.*.* and # IPv6 ::1 addresses are considered secure, this setting has no effect if # you connect from those addresses. disable_plaintext_auth = no # 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 " ## ## 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. login_chroot = no # 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. #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 create. If login_process_per_user is # yes, this is the number of extra processes waiting for users to log in. #login_processes_count = 3 # Maximum number of extra login processes to create. The extra 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 limit set by this # setting is reached. This setting is used only if login_process_per_use is yes. #login_max_processes_count = 128 # Maximum number of connections allowed in login state. When this limit is # reached, the oldest connections are dropped. If login_process_per_user # is no, this is a per-process value, so the absolute maximum number of users # logging in actually login_processes_count * max_logging_users. #login_max_logging_users = 256 ## ## Mail processes ## # Maximum number of running mail processes. When this limit is reached, # new users aren't allowed to log in. #max_mail_processes = 1024 # 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 # Show protocol level SSL errors. #verbose_ssl = 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 = 200 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 # 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 = # ':' 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 by # giving /./ in user's home directory (eg. /home/./user chroots into /home). #mail_chroot = # Default MAIL environment to use when it's not set. By leaving this empty # dovecot tries to do some automatic detection as described in # doc/mail-storages.txt. There's 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 user there's no domain # %h - home directory # # See doc/variables.txt for full list. Some examples: # # default_mail_env = maildir:/var/mail/%1u/%u/Maildir # default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u # default_mail_env = mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n # default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u:INDEX=MEMORY # Space-separated list of fields to cache for all mails. Currently these # fields are allowed followed by a list of commands they speed up: # # Envelope - FETCH ENVELOPE and SEARCH FROM, TO, CC, BCC, SUBJECT, # SENTBEFORE, SENTON, SENTSINCE, HEADER MESSAGE-ID, # HEADER IN-REPLY-TO # Body - FETCH BODY # Bodystructure - FETCH BODY, BODYSTRUCTURE # MessagePart - FETCH BODY[1.2.3] (ie. body parts), RFC822.SIZE, # SEARCH SMALLER, LARGER, also speeds up BODY/BODYSTRUCTURE # generation. This is always set with mbox mailboxes, and # also default with Maildir. # # Different IMAP clients work in different ways, that's why Dovecot by default # only caches MessagePart which speeds up most operations. Whenever client # does something where caching could be used, the field is automatically marked # to be cached later. For example after FETCH BODY the BODY will be cached # for all new messages. Normally you should leave this alone, unless you know # what most of your IMAP clients are. Caching more fields than needed makes # the index files larger and generate useless I/O. # # With maildir there's one extra optimization - if nothing is cached, indexing # the maildir becomes much faster since it's not opening any of the mail files. # This could be useful if your IMAP clients access only new mails. #mail_cache_fields = MessagePart # Space-separated list of fields that Dovecot should never set to be cached. # Useful if you want to save disk space at the cost of more I/O when the fields # needed. #mail_never_cache_fields = # Dovecot can notify client of new mail in selected mailbox soon after it's # received. This setting specifies the minimum interval in seconds between # new mail notifications to client - internally they may be checked more or # less often. Setting this to 0 disables the checking. # NOTE: Evolution client breaks with this option when it's trying to APPEND. #mailbox_check_interval = 0 # Like mailbox_check_interval, but used for IDLE command. #mailbox_idle_check_interval = 30 # 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 # Maximum allowed length for mail keyword name. It's only forced when trying # to create new keywords. #mail_max_keyword_length = 50 # 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. #mail_save_crlf = no # 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 in remote # 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 # Don't use fcntl() locking. Alternatives are dotlocking and other tricks # which may be slower. Required for NFS. fcntl_locks_disable = yes # 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 # Check if mails' content has been changed by external programs. This slows # down things as extra stat() needs to be called for each file. If changes are # noticed, the message is treated as a new message, since IMAP protocol # specifies that existing messages are immutable. #maildir_check_content_changes = no # Which locking methods to use for locking mbox. There's 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 = dotlock 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 = 30 # umask to use for mail files and directories #umask = 0077 # 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 # 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 # Log prefix for mail processes. See doc/variables.txt for list of possible # variables you can use. #mail_log_prefix = "%Up(%u): " ## ## IMAP specific settings ## protocol imap { # Login executable location. #login_executable = /usr/libexec/dovecot/imap-login # IMAP executable location #mail_executable = /usr/libexec/dovecot/imap # This would write rawlogs into ~/dovecot.rawlog/ directory: #mail_executable = /usr/libexec/dovecot/rawlog /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 modules. #mail_use_modules = no #mail_modules = /usr/lib/dovecot/imap # Workarounds for various client bugs: # oe6-fetch-no-newmail: # Never send EXISTS/RECENT when replying to FETCH command. Outlook Express # seems to think they are FETCH replies and gives user "Message no longer # in server" error. 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. #imap_client_workarounds = } ## ## POP3 specific settings ## protocol pop3 { # Login executable location. #login_executable = /usr/libexec/dovecot/pop3-login # POP3 executable location #mail_executable = /usr/libexec/dovecot/pop3 # Don't try to set mails non-recent 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_mails_keep_recent = no # Support for dynamically loadable modules. #mail_use_modules = no #mail_modules = /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. #pop3_client_workarounds = } ## ## Authentication processes ## # You can have multiple authentication processes. With plaintext authentication # the password is checked against each process, the first one which succeeds is # used. 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. # Executable location #auth_executable = /usr/libexec/dovecot/dovecot-auth # Set max. process size in megabytes. #auth_process_size = 256 # 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 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 = no auth default { # Space separated list of wanted authentication mechanisms: # plain digest-md5 cram-md5 apop anonymous mechanisms = plain # Where user database is kept: # passwd: /etc/passwd or similiar, using getpwnam() # passwd-file <path>: passwd-like file with specified location # static uid=<uid> gid=<gid> home=<dir template>: static settings # vpopmail: vpopmail library # ldap <config path>: LDAP, see doc/dovecot-ldap.conf # pgsql <config path>: a PostgreSQL database, see doc/dovecot-pgsql.conf # mysql <config path>: a MySQL database, see doc/dovecot-mysql.conf userdb = passwd # Where password database is kept: # passwd: /etc/passwd or similiar, using getpwnam() # shadow: /etc/shadow or similiar, using getspnam() # pam [<service> | *]: PAM authentication # checkpassword <path>: checkpassword executable authentication # passwd-file <path>: passwd-like file with specified location # vpopmail: vpopmail authentication # ldap <config path>: LDAP, see doc/dovecot-ldap.conf # pgsql <config path>: a PostgreSQL database, see doc/dovecot-pgsql.conf # mysql <config path>: a MySQL database, see doc/dovecot-mysql.conf passdb = pam # 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 # authentication with BSDs internally accesses shadow files, which also # requires roots. 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. #chroot = # Number of authentication processes to create #count = 1 # Require a valid SSL client certificate or the authentication fails. #ssl_require_client_cert = no } # PAM doesn't provide a way to get uid, gid or home directory. If you don't # want to use a separate user database (passwd usually), you can use static # userdb. #auth onlypam { # mechanisms = plain # userdb = static uid=500 gid=500 home=/var/mail/%u # passdb = pam # user = dovecot-auth #} #auth ldap { # mechanisms = plain # userdb = ldap /etc/dovecot-ldap.conf # passdb = ldap /etc/dovecot-ldap.conf # user = dovecot-auth #} #auth virtualfile { # mechanisms = plain digest-md5 # userdb = passwd-file /etc/passwd.imap # passdb = passwd-file /etc/passwd.imap # user = dovecot-auth #} # It's possible to export the authentication interface to other programs, # for example SMTP server which supports talking to Dovecot. Client socket # handles the actual authentication - you give it a username and password # and it returns OK or failure. So it's pretty safe to allow anyone access to # it. Master socket is used to a) query if given client was successfully # authenticated, b) userdb lookups. # listener sockets will be created by Dovecot's master process using the # settings given inside the auth section #auth default_with_listener { # mechanisms = plain # passdb = passwd # userdb = pam # socket listen { # master { # path = /var/run/dovecot/auth-master # #mode = 0600 # # Default user/group is the one who started dovecot-auth (root) # #user = # #group = # } # client { # path = /var/run/dovecot-auth-client # mode = 0660 # } # } #} # connect sockets are assumed to be already running, Dovecot's master # process only tries to connect to them. They don't need any other settings # than path for the master socket, as the configuration is done elsewhere. # Note that the client sockets must exist in login_dir. #auth external { # socket connect { # master { # path = /var/run/dovecot/auth-master # } # } #} [View Less]

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