- dovecot - dovecot.org

sockets created for lmtp
by Mike 20 Jan '22

20 Jan '22

Was recently configuring lmtp to listen in the postfix spool for mail. I set the socket as suggested in the documentation, however, when I look at what sockets were created there was an additional one for dovecot. Since I made the change, my expectation would have been just the one that I set up. I doubt it impacts it negatively, but I wanted to understand if I configured things correctly or not. Thanks. Mike

4 6

FTS Tokenization filters normalizer-icu vs lowercase
by Alessio Cecchi 20 Jan '22

20 Jan '22

Hi, I'm trying to setup fts-flatcurve with tokenization. What are the differences/benefits with "fts_filters = normalizer-icu" vs "fts_filters = lowercase"? Reading the Doc I found about normalizer-icu "This is potentially very resource intensive." and about lowercase "Supports UTF8, when compiled with libicu". So, using lowercase is almost the same that normalizer-icu but faster? FYI for using fts-flatcurve with dovecot RPM packages from repo.dovecot.org you have to rebuild with --with-icu --with-stemmer --with-textcat and related library. Thanks -- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice

2 1

Save of messages slow when replica unavailable
by Jörg Faudin Schulz 20 Jan '22

20 Jan '22

We have a setup with a dovecot server + replica. This works fine as long as the replica is available. When the replica is not available for some reason, the clients can work normally with one exception: the saving of sent messages to their inboxes takes ages. Thunderbird times out and complains (and duplicates the message), mail.app just waits until it's done. Is there any setting that helps here? For the time being, I deactivated replication; but this isn't a long time solution. Thank you for all your work&support, appreciating the doc as well.

1 0

dovecot-2.3.17: "Panic: file ioloop.c: line 865"
by Christian Küppers 20 Jan '22

20 Jan '22

Hello, we got the same backtrace in dovecot-ee version 2:2.3.17-8+ubuntu20.04 as Andreas Piper mentioned in November 2021 https://dovecot.org/pipermail/dovecot/2021-November/123468.html after installing dovecot package updates. Panic: file ioloop.c: line 865 (io_loop_destroy): assertion failed: (ioloop == current_ioloop) Error: Raw backtrace: #0 t_askpass[0x7fc609b0eba0] -> #1 backtrace_append[0x7fc609b0ee00] -> #2 backtrace_get[0x7fc609b0ef70] -> #3 i_syslog_error_handler[0x7fc609b1bfa0] -> #4 i_syslog_fatal_handler[0x7fc609b1c0d0] -> #5 i_panic[0x7fc609a6f1af] -> #6 i_error[0x7fc609a72906] -> #7 doveadm_http_server_deinit[0x55abd194af90] -> #8 doveadm_print_stream[0x55abd19447b0] -> #9 doveadm_print_istream[0x55abd1944810] -> #10 expunge_search_args_check[0x55abd1936a00] -> #11 expunge_search_args_check[0x55abd1935860] -> #12 doveadm_dsync_main[0x55abd1932900] -> #13 doveadm_cmd_ver2_to_mail_cmd_wrapper[0x55abd1933890] -> #14 doveadm_cmd_run_ver2[0x55abd1943fb0] -> #15 doveadm_server_deinit[0x55abd1948760] -> #16 io_loop_call_io[0x7fc609b32440] -> #17 io_loop_handler_run_internal[0x7fc609b33a00] -> #18 io_loop_handler_run[0x7fc609b32500] -> #19 io_loop_run[0x7fc609b32680] -> #20 master_service_run[0x7fc609aa4780] -> #21 main[0x55abd1923820] -> #22 __libc_start_main[0x7fc60970efc0] -> #23 _start[0x55abd1923980] Error: doveadm server disconnected before handshake: EOF Command fetch failed for <mailbox>: EOF We got it during doveadm fetch of a mail on multiple mailboxes. Is there any progress on this? Will it be fixed in next release? Kind regards, Christian Küppers Expert Administrator onOffice GmbH Charlottenburger Allee 5 | 52068 Aachen Tel. +49 (0)241 446 86-0 | Fax. +49 (0)241 446 86-250 E-Mail:c.kueppers@onoffice.de| Web:www.onOffice.com Registergericht: Amtsgericht Aachen, HRB 21420 Geschäftsführer: Dipl.-Kfm. Stefan Mantl Prokuristen: Janosch Reuschenbach, Kristina Andresen, Christian Mähringer

2 1

lmtp_save_to_detail_mailbox
by dovecot＠ptld.com 19 Jan '22

19 Jan '22

lmtp_save_to_detail_mailbox: " If the recipient address includes a detail element / role (as in user+detail format), save the message to the detail mailbox. " Im not understanding this, what is the "detail mailbox"? I tried testing this feature by setting "lmtp_save_to_detail_mailbox = yes" and sending an email to user+test(a)example.com. The email still ended up in the default inbox folder. So what does lmtp_save_to_detail_mailbox do or is there another setting that also needs to be set to use this feature?

3 5

Outlook vs. Dovecot experience
by Vladislav Kurz 18 Jan '22

18 Jan '22

Dear colleagues, what is your experience regarding using outlook (2016/365) as IMAP client and dovecot on server side? We have sync issues with outlook vs. cyrus IMAP server, and we consider moving to dovecot. But before that I'd like to hear from others if this combination works well. Especially if users have large and bushy mailboxes (>10 GB, >100 mailboxes), two mailboxes (accounts) on the same server. I don't want to do the migration just to find out that it is general issue of outlook vs. any IMAP server. -- Best regards Vladislav Kurz

7 10

JA3/JA3S as a Dovecot plugin?
by Sidsel Jensen 18 Jan '22

18 Jan '22

Hi We have been looking a bit into JA3 (https://engineering.salesforce.com/tls-fingerprinting-with-ja3-and-ja3s-247… <https://engineering.salesforce.com/tls-fingerprinting-with-ja3-and-ja3s-247…> and https://blog.squarelemon.com/tls-fingerprinting/ <https://blog.squarelemon.com/tls-fingerprinting/> ) for possible threat actor identifications. Roughly speaking you can think of JA3 as the TLS equivalent of the User-Agent string. Has anybody been looking into the possibility of building an open source dovecot JA3 plugin? I’d also like to hear the technical pros/cons of doing so…and perhaps the ethical deliberations also :-) Kind Regards, Sidsel

1 0

FTS flatcurve not index messages when SEARCH run on Virtual Mailboxes
by Alessio Cecchi 18 Jan '22

18 Jan '22

Hi, I'm testing FTS flatcurve plugin in order to understand if I can switch from FTS Solr to flatcurve. In my configuration I have enabled Virtual mailboxes and for search in all folders I just SEARCH on Virtual/All folder. I this (virtual) folder is not indexed with FTS Solr Dovecot start to index it (or all real folders). But with FTS flatcurve when I SEARCH on Virtual/All for the first time the indexer process does not start and the search return empty. Only if I run manually "doveadm index -q -u alessio(a)email.net '*'" flatcurve find messages. Can flatcurve have the same feature as Solr for Virtual mailboxes? Here a sample of my configuration: namespace Virtual { hidden = yes list = no location = virtual:/etc/dovecot/virtual:INDEX=~/Maildir/virtual prefix = Virtual/ separator = / subscriptions = no } namespace inbox { [...] mailbox virtual/All { comment = All my messages special_use = \All } } # cat /etc/dovecot/virtual/All/dovecot-virtual * all Thanks -- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice

3 6

Extracting CLIENTID information from checkpassword or postlogin scripting
by Dan Conway 18 Jan '22

18 Jan '22

Hello, When extracting client_id information from the client connection (i.e. setting imap_id_log = *) the information is directly logged by Dovecot as such: ID sent: name=Thunderbird, version=91.5.0 My question is, Is it possible to export/set this information in a checkpassword script or a postlogin script? client_id If|imap_id_retain| <https://doc.dovecot.org/settings/core/#core_setting-imap_id_retain>is enabled this variable is populated with the client ID request as IMAP arglist. I've enabled both checkpassword and postlogin on a test server, as well as 'imap_id_retain' set to 'yes'. I wrote a simple Perl script that dumps everything in %ENV as well as @ARGV for checkpassword and postlogin, but I don't see any occurrences of ID information. I've also tried to see if I could supply that variable in dovecot.conf by setting 'client_id' as a parameter, but that didn't seem to do the trick either. passdb { ... # Doesn't work args = /usr/local/bin/checkpassword.pl client_id # Doesn't work args = /usr/local/bin/checkpassword.pl %{client_id} ... } What am I missing? Is it possible to get these variables into an external script that checkpassword or postlogin executes? Thanks.

3 2

Order of loading and checking userdb on Ubuntu
by Mike 16 Jan '22

16 Jan '22

When using the lmtp service for local delivery, I'd like to change the user lookup to only use the user portion of the email address. I think I do that in the 20-lmtp.conf file, but not exactly sure how. From what I've found on the web, I just need to change the auth_username_format=%n. I feel confident that I'm not doing it right. older posts implied that the order things are loaded is an issue, but not sure if that is the case anymore. My goal is to set username_format for only lmtp. Thanks for any help.

1 1