October 2022 - dovecot

Dynamically set LDAP user namespace using two attributes
by Thomas Leuxner 26 Oct '22

26 Oct '22

Hi, I’m looking for a way to use two LDAP attributes to create a user-specific namespace to be expunged e.g. mailExpungeTrash=namespace/inbox/mailbox/%{ldap:mailTrashMailbox}/autoexpunge I can create the namespace fine returning the full string to be expunged: mailExpungeTrash=namespace/inbox/mailbox/Deleted\_Messages/autoexpunge However I want to alter the namespace using a second LDAP attribute like: mailExpungeTrash=namespace/inbox/mailbox/%{ldap:mailTrashMailbox}/autoexpunge Regards Thomas

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Re: ot: how to t/s TBird problems ?
by Joseph Tam 26 Oct '22

26 Oct '22

Voytek Eymont) wrote: > yesterday it was > --------------- > I'm still experiencing a 40 second delay to retrieve emails for > xxx If *this* is the problem you saw (and not the 2 hour delay mentioned further in the thread), you can get a hint where the problem lies if you see a 40s gap in the session logs: it will tell you who was doing what when the pause happened (e.g. during authentication? During LIST fetch? During message fetch?) For example, if dovecot was busy mulching through a large INBOX rebuilding indices, I can see how it can chew up 40s under some circumstances. Joseph Tam <jtam.home(a)gmail.com>

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how to clean virtual users correctly
by Henry R 26 Oct '22

26 Oct '22

Hello I removed the user in static userdb file, and deleted /var/mail/vhosts/$domain/$user dir. when I recreated the user, the system dirs (sent, draft etc) disappeared. Anything wrong here? Thank you. -- Henry R https://openmbox.net/

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Re: ot: how to t/s TBird problems ?
by Joseph Tam 23 Oct '22

23 Oct '22

Voytek Eymont writes: > I've enabled logging as per your suggestion: > > -rw------- 1 vmail vmail 127 Oct 16 21:38 20221016-213738.25640.1.in > -rw------- 1 vmail vmail 8546603 Oct 16 21:38 20221016-213738.25640.1.out > -rw------- 1 vmail vmail 96 Oct 16 21:58 20221016-215757.26075.1.in > -rw------- 1 vmail vmail 8343463 Oct 16 21:58 20221016-215757.26075.1.out > > # cat 20221016-213738.25640.1.in > 1665916659.491025 STAT > 1665916659.550829 LIST > 1665916676.430794 UIDL > 1665916693.761281 RETR 114437 > 1665916694.440965 QUIT > # cat 20221016-215757.26075.1.in > 1665917878.786953 STAT > 1665917878.863136 LIST > 1665917905.610805 UIDL > 1665917924.491198 QUIT > # > > what should I look in the .out file ? > > some of the file is like: > .... > 1665916661.234807 114436 70097 > 1665916661.234814 114437 154498 > 1665916661.234821 . > 1665916676.430870 +OK > 1665916676.981415 1 000024b95283283a > 1665916676.981459 2 000024ba5283283a > .... > > 1665916679.434297 114436 00033fcf5283283a > 1665916679.434327 114437 00033fd05283283a > 1665916679.434349 . > 1665916694.048139 +OK 154498 octets > 1665916694.048199 Return-Path: <buyer-notice14.g(a)mail.aliexpress.com> > .... I haven't seen anyone else replying, but there doesn't seem anything anomalous with the output. The session commands-repliesd is is more or less what I expect, although to make sense of this, you'll have to splice the input and output files together using timestamps to see the sequential flow of data. I forget what the symptoms you originally reported, but theoretically, you could simulate either client or server by feeding in the above data and see how the other end behaves. If dovecot is serving out the correct data, then TB is somehow misinterpreting it. > on an uneducated guess, the mailbox is just 'too large' ? > POP has difficulty handling so many files ? Typically, if some resource limit is hit, one side or the other will create a log or notification. Your INBOX is large, but not outrageous. You can test it directly by creating smaller subsets of the INBOX messages and see if the problem goes away. Joseph Tam <jtam.home(a)gmail.com>

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Office 365 SSL issue
by Ervin Hegedüs 23 Oct '22

23 Oct '22

Hi there, I have a bit old Dovecot instance (Ubuntu 14.04 - there is no chance to upgrade it), with these versions of packages: * Dovecot: 2.2.9 * OpenSSL: 1.0.1f Few days ago a client noticed me, that he can't reach his mails through his Office 365. He uses POP3S. I tried to set up a same client for this Dovecot server, but when I configured the POP3 protocoll, after the settings check Office says: Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server ... While the client was trying, I see these lines in the log: Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x10, ret=1: before/accept initialization [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: before/accept initialization [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 read client hello A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write server hello A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write certificate A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write key exchange A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write server done A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2001, ret=1: SSLv3 flush data [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client certificate A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client certificate A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Warning: SSL failed: where=0x2002: SSLv3 read client certificate A [192.168.8.133] Oct 21 16:12:18 mail dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=192.168.8.133, lip=192.168.8.21, TLS handshaking: Disconnected, session=<9sWMB4zr+ADAqAiF> Which is weird, because I disabled SSLv3. Here is the (relevant) config: ssl_cert = </etc/dovecot/dovecot.crt ssl_key = </etc/dovecot/dovecot.key ssl_dh_parameters_length = 2048 ssl_protocols = !SSLv2 !SSLv3 ssl_cipher_list = ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA verbose_ssl = yes When I check the supported encryption type with nmap, I get this: $ nmap --script ssl-enum-ciphers -p 995 192.168.8.21 Starting Nmap 7.80 ( https://nmap.org ) at 2022-10-22 10:20 CEST Nmap scan report for 192.168.8.21 Host is up (0.021s latency). PORT STATE SERVICE 995/tcp open pop3s | ssl-enum-ciphers: | TLSv1.0: | ciphers: | TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A | ... | TLSv1.1: | ciphers: | TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A | ... | TLSv1.2: | ciphers: | TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A | ,,, |_ least strength: C When I check the traffic with tcpdump, I see that client uses TLSv1.2: https://www.dropbox.com/s/k8wqzg5xzki5p23/pop3_traffic.png Only the one client who reported the problem, and my test client can't reach the server - other (about) 400 users can (but I don't know with what kind of types of clients - most use Thunderbird). What can I do? How can I fix this problem? As I wrote, this problem has came few days ago suddenly... Thanks, a.

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Change password schema and post-login script
by Christos Chatzaras 23 Oct '22

23 Oct '22

Hello, Question #1: For version 2.3.19.1 these commands use BLF-CRYPT, right? doveadm pw doveadm pw -s CRYPT Question #2: I want to change password schema for current users. For users using POP3 or IMAP I can do it using a post-login script. I have some accounts used only to send e-mails using Postfix, so no POP3/IMAP logins for these accounts. Is any way to change password schema for these accounts? My config: # 2.3.19.1 (9b53102964): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.19 (4eae2f79) # OS: FreeBSD 13.1-RELEASE-p2 amd64 zfs # Hostname: server2.example.com auth_master_user_separator = * auth_mechanisms = plain login auth_verbose = yes default_process_limit = 225 disable_plaintext_auth = no first_valid_gid = 0 first_valid_uid = 1001 mail_location = maildir:/home/mail/%d/%n:INDEX=/tmpfs/dovecot_%u:CONTROL=/var/mail/%d/%n mail_privileged_group = mail 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 index ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /usr/local/etc/dovecot/passwd.master driver = passwd-file master = yes result_success = continue } passdb { args = /usr/local/etc/dovecot/passwd.suspended deny = yes driver = passwd-file } passdb { args = /usr/local/etc/dovecot/passwd driver = passwd-file } plugin { imapsieve_mailbox1_before = file:/usr/local/lib/dovecot/sieve/report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Junk imapsieve_mailbox2_before = file:/usr/local/lib/dovecot/sieve/report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * quota = maildir:User quota quota_max_mail_size = 100M quota_rule = *:storage=2048M quota_status_nouser = DUNNO quota_status_overquota = 552 5.2.2 Mailbox is full quota_status_success = DUNNO quota_warning = storage=80%% quota-warning 80 %u sieve = file:~/sieve;active=~/sieve.active sieve_before = /usr/local/lib/dovecot/sieve/antispam.sieve sieve_global_extensions = +vnd.dovecot.pipe sieve_pipe_bin_dir = /usr/local/lib/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms } protocols = imap pop3 lmtp sieve service auth { client_limit = 1125 unix_listener auth-client { group = postfix mode = 0660 user = postfix } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service managesieve-login { inet_listener sieve { address = 127.0.0.1 port = 4190 } } service quota-status { client_limit = 1 executable = quota-status -p postfix inet_listener { port = 12340 } } service quota-warning { executable = script /root/cretapanel/quota-warning.sh unix_listener quota-warning { mode = 0666 user = dovecot } } ssl_cert = </etc/ssl/certs/mail.pem ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it ssl_min_protocol = TLSv1.2 userdb { args = /usr/local/etc/dovecot/passwd driver = passwd-file } verbose_proctitle = yes protocol imap { imap_client_workarounds = delay-newmail tb-extra-mailbox-sep mail_max_userip_connections = 20 mail_plugins = quota imap_quota imap_sieve imap_zlib } protocol pop3 { mail_plugins = quota pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv } protocol lda { postmaster_address = postmaster(a)example.com sendmail_path = /usr/sbin/sendmail } protocol lmtp { mail_plugins = quota sieve postmaster_address = postmaster(a)example.com }

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dovecot mailing list (this mailing list), DKIM, SPF and DMARC
by Lev Serebryakov 22 Oct '22

22 Oct '22

My domain (serebrtyajov.spb.ru) has all these "new" e-mail technologies configured. It works fine till I write to this mailing list. After that I've got several DMARC reports about "spam" from my domain. All these reports are about my mailing list post. I don't have such problems with other mailing lists (FreeBSD ones, OpenJDK ones, and others). Looks like mailing list software for this mailing list is misconfigured. I'm sure, I'll get new after this message. -- // Black Lion AKA Lev Serebryakov

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lmtp userdb can't resolve users
by George Asenov 21 Oct '22

21 Oct '22

Hello, I use postfix with dovecot as an lmtp LDA with unix users and multiple domain names and mailboxes in Maildir format placed in domain directory like: /home/mainuser/homes/user(a)domain.tld/Maildir or /home/mainuser/domains/domain2.tld/homes/user(a)domain2.tld/Maildir which have the main user as a group and user@domain.tld/user@domain2.tld as owner Postfix have virtual_alias_maps = hash:/etc/postfix/virtual there in virtual file there is map like: user(a)domain.tld user-domain(a)domain.tld and in /etc/passwd there are actually 2 users with the same home dir and same UID/GID (only the username is different) and in postfix mailbox_transport = lmtp:unix:private/dovecot-lmtp The issue is that when postfix passes the email for local delivery to dovecot lmtp it sends the username as user-domain.tld(a)serverhostname.tld but dovecot is configured with !include auth-system.conf.ext can't resolve this username thus fails to deliver. I've found a workaround in the net to use custom userdb just for lmtp like this: protocol lmtp { mail_plugins = $mail_plugins sieve userdb { driver = passwd-file args = username_format=%n /etc/passwd } } which works but produce some warnings because there is the root user (ID 0) and actually is a dirty workaround Is there more elegant solution??

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sieve script is too large (max 1048576 bytes)
by Marc 19 Oct '22

19 Oct '22

In what section of the config is this limited? I assume it is related to this >go1.13 memory model that allocates quite a lot of vsz?

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mdbox vs. maildir format
by Michael 19 Oct '22

19 Oct '22

hey, i am considering changing my mailbox format from maildir to mdbox. the reason for this is mainly, b/c i have (a) multiple large mailboxes with tens of thousands of mail files, and (b) most of these mails files have a size significantly smaller than the sector size of the disk. so, since the emails themselves are only about nGB large, the disk space used is at least twice as much, if not even three times. i know, hard disk space is 'cheap', but still... but then i read at https://doc.dovecot.org/admin_manual/mailbox_formats/dbox/ the following: [...] you must not lose the dbox index files, as they can’t be regenerated without data loss. so, raid is mandatory, which is already the case, but what about backup? how can i achieve a backup/snapshot of both, the mdbox (nfs share) and the index files (local raid) and assure they are consistent? greetings...

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