March 2018 - dovecot - dovecot.org

limit pop login per user and per minute
by Markus Eckerl 22 Mar '18

22 Mar '18

Hi, like I have written in the subject line I want to limit the pop login per user and per minute. Currently I am having several customers which are fetching their email with popcon (MS Exchange). This has never been a problem. But... They all have got the same "technician" which take care of their systems. The problem is, that he misconfigured the servers of these customers. In detail: their servers are trying to fetch email every 2 - 5 seconds. For every email address. In the past I contacted the technician and told him about his mistake. He was not very helpful and simply told me that he is doing the same configuration since several years at all of his customer servers. Without problems. It is up to me to fix my problem myself. Well, I googled a lot but all I found is to limit for a specific IP or for a secific account. Both is not what I am looking for. Maybe someone can give me a hint? Thanks and kind regards Markus -- stairweb GmbH Firmensitz: Gutenbergstr. 8, 94036 Passau Telefon: +49 (0)851 / 20426650 Telefax: +49 (0)851 / 20426655 e-Mail: info(a)stairweb.de Internet: www.stairweb.de Registergericht: Amtsgericht Passau, HRB 6044 Geschäftsführer: Markus Eckerl, Karl Preißler, Alexander Lengl

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why is dovecot "Allowing any password"
by mj 22 Mar '18

22 Mar '18

Hi, I noticed the following in the logs of our debian wheezy server: > Mar 21 07:13:47 mail dovecot: auth: Debug: ldap(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): bind search: base=CN=Users, DC=samba, DC=company, DC=com filter=(&(objectclass=person)(sAMA > ccountName=username)(!(userAccountControl=514))) > Mar 21 07:13:47 mail dovecot: auth: Debug: ldap(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): result: uid=username; uid unused > Mar 21 07:13:47 mail dovecot: auth: Debug: ldap(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): result: uid=username > Mar 21 07:13:48 mail dovecot: auth: ldap(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): invalid credentials (given password: invalid_password) > Mar 21 07:13:48 mail dovecot: auth: Debug: static(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): lookup > Mar 21 07:13:48 mail dovecot: auth: Debug: static(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): allow_nets: Matching for network 127.0.0.1/32 > Mar 21 07:13:48 mail dovecot: auth: static(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): allow_nets check failed: IP not in allowed networks > Mar 21 07:13:48 mail dovecot: auth: Debug: static(username,1.2.3.4,<g2/rF+ZnjAAu5ceg>): Allowing any password > Mar 21 07:13:54 mail dovecot: auth: Debug: auth client connected (pid=6174) The line second last line "Allowing any password" comes as a surprise..? Why would dovecot Allow any password..? We had the following bit in our config, but I removed it now: > #passdb { > # driver = static > # args = nopassword=y allow_nets=127.0.0.1/32 > #} Could anyone expain the "Allowing any password"? And lastly our current doveconf -n: > # 2.2.13: /etc/dovecot/dovecot.conf > # OS: Linux 3.2.0-5-amd64 x86_64 Debian 7.11 xfs > auth_debug = yes > auth_debug_passwords = yes > auth_failure_delay = 10 secs > auth_master_user_separator = * > auth_mechanisms = plain login > auth_username_format = %Ln > auth_verbose = yes > auth_verbose_passwords = plain > deliver_log_format = %f | %s | msgid=%m: %$ > disable_plaintext_auth = no > lda_mailbox_autocreate = yes > lda_mailbox_autosubscribe = yes > login_greeting = Dovecot ready. > mail_gid = vmail > mail_location = maildir:/var/vmail/%Ln/Maildir:LAYOUT=fs:DIRNAME=mAildir > mail_plugins = acl lazy_expunge zlib quota mail_log notify > mail_uid = vmail > managesieve_notify_capability = mailto > managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave > namespace { > list = children > location = maildir:/var/vmail/%%u/Maildir:LAYOUT=fs:DIRNAME=mAildir:INDEX=/var/vmail/%u/shared/%%u > prefix = shared/%%n/ > separator = / > subscriptions = no > type = shared > } > namespace inbox { > inbox = yes > location = > mailbox "Deleted items" { > special_use = \Trash > } > mailbox Drafts { > special_use = \Drafts > } > mailbox Junk { > special_use = \Junk > } > mailbox Sent { > special_use = \Sent > } > mailbox "Sent items" { > special_use = \Sent > } > mailbox Trash { > special_use = \Trash > } > mailbox inbox { > auto = subscribe > } > prefix = > separator = / > type = private > } > passdb { > args = /etc/dovecot/master-users > driver = passwd-file > master = yes > } > passdb { > args = /etc/dovecot/dovecot-ldap.conf.ext > driver = ldap > } > plugin { > acl = vfile > acl_shared_dict = file:/var/lib/dovecot/db/shared-mailboxes.db > mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename append > mail_log_fields = uid box msgid from subject > quota = maildir > quota_rule = ?:storage=5G > quota_rule2 = Trash:storage=+100M > quota_warning = storage=97%% quota-warning 97 %u > quota_warning2 = storage=95%% quota-warning 95 %u > quota_warning3 = storage=90%% quota-warning 90 %u > quota_warning4 = storage=85%% quota-warning 85 %u > quota_warning5 = storage=80%% quota-warning 80 %u > quota_warning6 = -storage=100%% quota-warning below %u > sieve = ~/.dovecot.sieve > sieve_default = /var/lib/dovecot/default.sieve > sieve_dir = ~/sieve > } > protocols = imap lmtp sieve > service auth { > unix_listener /var/spool/postfix/private/auth { > mode = 0666 > } > unix_listener auth-userdb { > group = vmail > mode = 0666 > user = vmail > } > } > service imap-login { > process_limit = 500 > process_min_avail = 2 > } > service quota-warning { > executable = script /usr/local/bin/quota-warning.sh > unix_listener quota-warning { > user = vmail > } > user = dovecot > } > shutdown_clients = no > ssl_ca = </etc/ssl/letsencrypt/fullchain.pem > ssl_cert = </etc/ssl/letsencrypt/cert.pem > ssl_key = </etc/ssl/letsencrypt/key.pem > ssl_protocols = !SSLv2 !SSLv3 > userdb { > args = uid=vmail gid=vmail home=/var/vmail/%n allow_all_users=yes > driver = static > } > verbose_proctitle = yes > protocol lda { > mail_plugins = acl lazy_expunge zlib quota mail_log notify sieve quota > } > protocol imap { > imap_max_line_length = 2 M > mail_max_userip_connections = 30 > mail_plugins = acl lazy_expunge zlib quota mail_log notify imap_quota imap_acl > } MJ

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dovecot-uidlist is not up-to-date
by Dmitry Filonov 22 Mar '18

22 Mar '18

Hi, Am using dovecot-2.2.10-8 on Centos-7 and everything seemed to be totally fine for many years. Now am trying to migrate our on-premises mail server to the cloud and I had to get some statistics. I was doing that using the doveadm utility. Unfortunately I found that the numbers don't match if I check the real messages in my Maildirs. For some account doveadm was reporting number of messages but that account didn't have any messages stored at all. So I looked a bit further and found that doveadm utility reports data form indexes and indexes are built using dovecot-uidlist data. For quite some folders these files have way more data than actual mailbox has. For example, my personal Inbox has 569 messages but dovecot-uidlist has 716 entries. I don't know when and how that happened but this happens a lot on many different mailboxes on my server. I never touched dovecot-uidlist files outside of dovecot. I might have removed messages from Maildirs though, but not at this scale. Now the question is if there's any way to tell dovecot to rebuild dovecot-uidlist files using actual Maildir data. I don't want to remove dovecot-uidlist files as this triggers the whole mailbox being re-downloaded by the imap client. With some accounts having over 100Gb of mail this is too much of a hassle. I just need dovecot itself to fix it's data. Thanks, Fil -- Dmitry Filonov Network Analyst 300 Longwood Ave. Enders-1262.2 Boston, MA 02115 617-919-4702

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"failed to map segment from shared object" in sieve pipe
by Dorian Taylor 22 Mar '18

22 Mar '18

Hello, I have encountered a problem attempting to run a program in a sieve pipe. The program is a Perl script that loads a number of binary (XS) modules at runtime. The program crashes, it appears, if it tries to load too many. The (non-Perl part of the) error message is "failed to map segment from shared object” — no additional information. Cryptic error messages like this have the odour of imposed resource restrictions, so I’m wondering if there are any on the pipe/filter/execute implementation (e.g. via program_client_run). Any configuration knobs I can twiddle? Any insights for debugging? PS this is the dovecot 2.2.22 (fe789d2), the one that ships with Ubuntu Xenial. Regards, -- Dorian Taylor Make things. Make sense. https://doriantaylor.com

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Fwd: Fwd: Everything works except sending mail
by Armin Tangelder 21 Mar '18

21 Mar '18

(Sorry Aki I send it wrong the first time, I feel like a n00b) ---------- Forwarded message ---------- From: Armin Tangelder <a.tangelder(a)gmail.com> Date: Tue, Mar 20, 2018 at 3:25 PM Subject: Re: Fwd: Everything works except sending mail To: Aki Tuomi <aki.tuomi(a)dovecot.fi> Hi Aki, Mij postfix is sending and receiving mail. it might be an issue between Postfix and Dovecot. That is why I'm asking if one of the more experienced guru's ever did see something like this. A mail doesn't even reach the Postfix queue. And in paralel, I'm with this on postfix forums to take a look as well. But as Postfix probably is not discussed here I kept it to Dovecot only. But based on the dovecot -n you see anything wrong? Thnx, Armin Tangelder -- Very funny scotty, now beam down my clothes. On Tue, Mar 20, 2018 at 12:13 PM, Aki Tuomi <aki.tuomi(a)dovecot.fi> wrote: > This sounds more like postfix problem. > > Aki > > On 20.03.2018 13:04, Armin Tangelder wrote: > > Hi people, > > > > Version of my beloved Dovecot installation: > > 2.2.27 (c0f36b0) > > > > I moved from a OS X server to a Linux (Ubuntu) Headless server. > All fun and good to play around with. Love almost everything. > > In the combination with Postfix and Dovecot I’m stuck to despair into > oblivion. > > > > Everything works except I cannot send mail from my (OS X) Outlook client I > keep getting: > > > > Connection to the server failed or was dropped. Error Code -3253 > > > > Nothing More and nothing less. O do not get any other error in a logfile > or anything. > And I followed almost every installation manual I found. Postfix I can > send and receive through telnet. > But I just can’t get this to work… > > The mail doesn’t even reach Postfix queue as I cannot connect to send. > I do have a awesome connection receiving my mail though ☺ > > Anyway: > > dovecot -n gives this (and I probably don’t see it anymore as I’ve been at > this for several days now) > > # 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf > > # Pigeonhole version 0.4.16 (fed8554) > > # OS: Linux 4.13.0-37-generic x86_64 Ubuntu 17.10 > > auth_mechanisms = plain login > > auth_realms = formule1.demon.nl > > login_greeting = Dovecot ready. > > mail_location = maildir:~/Maildir > > mail_max_userip_connections = 50 > > namespace inbox { > > inbox = yes > > location = > > mailbox Drafts { > > special_use = \Drafts > > } > > mailbox Junk { > > special_use = \Junk > > } > > mailbox Sent { > > special_use = \Sent > > } > > mailbox "Sent Messages" { > > special_use = \Sent > > } > > mailbox Trash { > > special_use = \Trash > > } > > prefix = > > } > > passdb { > > driver = pam > > } > > protocols = imap > > service auth { > > unix_listener /var/spool/postfix/private/auth { > > group = postfix > > mode = 0666 > > user = postfix > > } > > } > > ssl_cert = </etc/ssl/certs/server.crt > > ssl_key = # hidden, use -P to show it > > userdb { > > driver = passwd > > } > > > > Anything useful I would love to see. > Any information needed. > > > > THNKS… > > > > Armin > > -- > > Very funny Scotty, now beam down my clothes… > > >

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v2.2.35 released
by Aki Tuomi 21 Mar '18

21 Mar '18

https://dovecot.org/releases/2.2/dovecot-2.2.35.tar.gz https://dovecot.org/releases/2.2/dovecot-2.2.35.tar.gz.sig - charset_alias: compile fails with Solaris Studio, reported by John Woods. - Fix local name handling in v2.2.34 SNI code, bug found by cPanel. - imapc: Don't try to add mails to index if they already exist there. - imapc: If email is modified in istream_opened hook, mail size isn't updated. - lib-dcrypt: When reading encrypted data, more data would not be read if buffer was not consumed causing panic or hang. - notify: When notify plugin is used and transaction commit fails in dsync, crash occurs. - sdbox: When delivering to a mailbox that is over quota, temp files are not cleaned up when saving or copying fails.

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dovecot caching decisions
by Sivathmican Sivakumaran 21 Mar '18

21 Mar '18

Hello guys, Should the following configuration: mail_cache_fields = flags,imap.body,imap.bodystructure mail_always_cache_fields = imap.body,imap.bodystructure have an effect on the following command? doveadm index -u bob INBOX It seems to have no effect for some reason. Regards, Siva

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pylori error in dovecot log
by ＠lbutlr 20 Mar '18

20 Mar '18

I am getting the following in my /var/log/dovecot: Error: sieve: Execution of script /usr/lib/dovecot/sieve/report-spam.sieve failed Error: plugin: failed to parse plugin (from @INC): Can't locate Mail/SpamAssassin/Plugin/Razor.pm in @INC (you may need to install the Mail::SpamAssassin::Plugin::Razor module) (@INC contains: /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/site_perl/mach/5.24 /usr/local/lib/perl5/5.24/mach /usr/local/lib/perl5/5.24) at (eval 44) line 1. Error: program `/usr/lib/dovecot/sieve/sa-learn-spam.sh' was forcibly terminated with signal 15 Error: sieve: pipe action: failed to pipe message to program `sa-learn-spam.sh': refer to server log for more information. [2018-03-19 12:52:51] Info: sieve: left message in mailbox 'Junk'

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Compiling from sources and security contexts (dovecot_selinux)
by TraxOnDaRocks 20 Mar '18

20 Mar '18

Hi, installation by prebuilt binaries creates security contexts on each file (as shown here https://linux.die.net/man/8/dovecot_selinux) so that dovecot integrates perfectly in SELinux. I've compiled instead from sources (as described here https://wiki2.dovecot.org/CompilingSource) and i'd like to know how create same security contexts of prebuilt binaries to have an identical behaviour in SELinux. Thank you

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Permissions on /var/log/dovecot
by ＠lbutlr 20 Mar '18

20 Mar '18

/var/log/dovecot exists and has a lot of logging in it, but I get errors (in mail.log) on an always_bcc action in postfix: mail postfix/pipe[13015]: 401cvS0R8BzbSkL: to=<backup+073.kremels-kreme(a)doamin.tld>, relay=dovecot, delay=398058, delays=398045/13/0/0.04, dsn=4.3.0, status=deferred (temporary failure. Command output: Can't open log file /var/log/dovecot: Permission denied ) What should the permissions on /var/log/dovecot be? (they are 640 root:wheel on FreeBSD, identical to mail.log)

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