- dovecot - dovecot.org

Disable sieve redirect filters?
by jarland＠mxroute.com 21 Mar '24

21 Mar '24

Right now we're using Dovecot for sieve filters. Good old fairly standard config: https://mxbin.io/N6hDUi I'm hoping someone has an idea, but I think I'm probably on my own here. The problem is that this is the best solution to preventing people from spoofing external senders when creating redirects to external recipients: sieve_redirect_envelope_from = recipient But also, as great as this is, it kind of sucks because users continually insist on receiving spam and phishing emails. When a user sends a phishing email, I step in to make sure our network isn't being abused. That's how we do what we do for high quality inbox delivery, we police the hell out of our network. So my problem is I end up with all of these users that I need to review every day, only to find out they just created a redirect filter and "redirected" a phishing email. So my long winded question is, how can I disable redirect filters? I don't want users to be able to create them. But I want them to have access to the rest of the functions of the sieve filtering. Is this possible, or would this need to be an entirely new function contributed to the project's code?

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Notifications to over-quota accounts
by N V 15 Mar '24

15 Mar '24

Hello! I'm trying to allow a system email address to send notifications to over-quota accounts. Is there a way to do it? Thanks in advance! Hello! I'm trying to allow a system email address to send notifications to over-quota accounts. Is there a way to do it? Thanks in advance!

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Question about sieve language
by Lev Serebryakov 15 Mar '24

15 Mar '24

Hello! I need to match all messages sent from some specific domain and all its sub-domains. I can achieve this with: if address :match :domain "From" [ "domain.com", "*.domain.com" ] { ... } But it looks ugly, especially if repeated for 5-6 domains. Is here way better? `:match ["*domain.com"]` will match "notdomain.com" and `:is [ "domain.com" ] doesn't match sub-domains. I understand, that it is (slightly?) off-topic, but I can not find any sieve-specific resources (all google find ins questions about PronotMail and FastMail filters, and these questions are very basic). Thank you. -- // Black Lion AKA Lev Serebryakov

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antispoofing with dovecot submission
by Adrian M 15 Mar '24

15 Mar '24

Hi, it is possible to do antispoofing, like reject_authenticated_sender_login_mismatch from postfix ? Hi, it is possible to do antispoofing, like reject_authenticated_sender_login_mismatch from postfix ?

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How to get a memory pointer in the core process
by Joan Moreau 15 Mar '24

15 Mar '24

Hi Is it possible, from a plugin perspective, to create and recover a pointer in the core process (i.e. memory not lost between 2 calls to the plugin, even after the "deinit" of the plugin" ) ? Thanks Hi Is it possible, from a plugin perspective, to create and recover a pointer in the core process (i.e. memory not lost between 2 calls to the plugin, even after the "deinit" of the plugin" ) ? Thanks

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dovecot panic
by Michael Grant 15 Mar '24

15 Mar '24

I'm running dovecot 2.3.19.1 on debian stable. I just started seeing a slew of these in my log: Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap(mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Panic: file istream-header-filter.c: line 663 (i_stream_header_filter_snapshot_free): assertion failed: (snapshot->mstream->snapshot_pending) Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap(mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Error: Raw backtrace: #0 test_subprocess_fork[0x7f1a33d7ca20] -> #1 backtrace_append[0x7f1a33d7cc90] -> #2 backtrace_get[0x7f1a33d7ce20] -> #3 execvp_const[0x7f1a33d89f90] -> #4 i_syslog_fatal_handler[0x7f1a33d8a900] -> #5 i_panic[0x7f1a33ce00a4] -> #6 fs_wrapper_unlock[0x7f1a33cdb71d] -> #7 i_stream_snapshot_free[0x7f1a33d96110] -> #8 i_stream_unref[0x7f1a33d96180] -> #9 index_mail_get_virtual_size[0x7f1a33f2d190] -> #10 index_mail_save_finish[0x7f1a33f2d470] -> #11 index_mail_get_special[0x7f1a33f2d690] -> #12 mail_get_special[0x7f1a33eaf950] -> #13 cmd_select[0x560714f983e0] -> #14 imap_fetch_begin[0x560714f9d170] -> #15 imap_fetch_more[0x560714f9d550] -> #16 cmd_fetch[0x560714f91c00] -> #17 command_exec[0x560714f9a880] -> #18 cmd_x_cancel[0x560714fa0510] -> #19 cmd_x_cancel[0x560714fa0510] -> #20 cmd_x_cancel[0x560714fa0510] -> #21 client_handle_input[0x560714fa0880] -> #22 client_input[0x560714fa0d80] -> #23 io_loop_call_io[0x7f1a33da1c70] -> #24 io_loop_handler_run_internal[0x7f1a33da3970] -> #25 io_loop_handler_run[0x7f1a33da3b00] -> #26 io_loop_run[0x7f1a33da3cd0] -> #27 master_service_run[0x7f1a33d14180] -> #28 main[0x560714f8ca00] -> #29 __libc_init_first[0x7f1a33ac51d0] -> #30 __libc_start_main[0x7f1a33ac5280] -> #31 _start[0x560714f8d000] I realize this is a slightly old version of dovecot but this is what's in debian's stable package repository. I see 2.3.21+dfsg1-2 in testing and 2.3.21+dfsg1-3 in unstable. I really try to avoid installing this on production. I didn't recently change anything in my configs on the server. I did start recently using 'eM Client' on Windows a couple days ago, could that have caused this? Mail seems to continue to come in to my imap clients, but these errors in the log are worrying! Michael Grant I'm running dovecot 2.3.19.1 on debian stable. I just started seeing a slew of these in my log: Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap (mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Panic: file istream-header-filter.c: line 663 (i_stream_header_filter_snapshot_free): assertion failed: (snapshot- >mstream->snapshot_pending) Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap (mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Error: Raw backtrace: #0 test_subprocess_fork[0x7f1a33d7ca20] -> #1 backtrace_append[0x7f1a33d7cc90] - > #2 backtrace_get[0x7f1a33d7ce20] -> #3 execvp_const[0x7f1a33d89f90] -> #4 i_syslog_fatal_handler[0x7f1a33d8a900] -> #5 i_panic[0x7f1a33ce00a4] -> #6 fs_wrapper_unlock[0x7f1a33cdb71d] -> #7 i_stream_snapshot_free[0x7f1a33d96110] -> #8 i_stream_unref[0x7f1a33d96180] -> #9 index_mail_get_virtual_size [0x7f1a33f2d190] -> #10 index_mail_save_finish[0x7f1a33f2d470] -> #11 index_mail_get_special[0x7f1a33f2d690] -> #12 mail_get_special[0x7f1a33eaf950] -> #13 cmd_select[0x560714f983e0] -> #14 imap_fetch_begin[0x560714f9d170] - > #15 imap_fetch_more[0x560714f9d550] -> #16 cmd_fetch[0x560714f91c00] -> #17 command_exec[0x560714f9a880] -> #18 cmd_x_cancel[0x560714fa0510] -> #19 cmd_x_cancel[0x560714fa0510] -> #20 cmd_x_cancel[0x560714fa0510] -> #21 client_handle_input[0x560714fa0880] -> #22 client_input[0x560714fa0d80] -> #23 io_loop_call_io[0x7f1a33da1c70] -> #24 io_loop_handler_run_internal [0x7f1a33da3970] -> #25 io_loop_handler_run[0x7f1a33da3b00] -> #26 io_loop_run [0x7f1a33da3cd0] -> #27 master_service_run[0x7f1a33d14180] -> #28 main [0x560714f8ca00] -> #29 __libc_init_first[0x7f1a33ac51d0] -> #30 __libc_start_main[0x7f1a33ac5280] -> #31 _start[0x560714f8d000] I realize this is a slightly old version of dovecot but this is what's in debian's stable package repository. I see 2.3.21+dfsg1-2 in testing and 2.3.21+dfsg1-3 in unstable. I really try to avoid installing this on production. I didn't recently change anything in my configs on the server. I did start recently using 'eM Client' on Windows a couple days ago, could that have caused this? Mail seems to continue to come in to my imap clients, but these errors in the log are worrying! Michael Grant

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Re: [EXT] Re: How to get a memory pointer in the core process
by Joseph Tam 15 Mar '24

15 Mar '24

From: Joan Moreau > I am trying to avoid closing/ reopening a file pointer to the exact same file > between each call to the plugin Can't you do an end-run around all this by having a persistent standalone process that holds all your persistent data, and the plugin collects session data and passes it to the persistent process via sockets? You'll have to have some initial handshake protocol to establish session context, but this seems the easiest way to accomplish what you want. Joseph Tam <jtam.home(a)gmail.com>

1 0

dovecot and solr clustering
by Maciej Milaszewski 13 Mar '24

13 Mar '24

Hi I have 1 director and ~8 dovecot nodes. I thinking about Solr cluster beacuse one server solr probably is not enough. I thinking about SolrCloud Mode but I don't know if it will work with Dovecot And if not SolrCloud Mode, then what? I don't have much experience in Solr clustering and I want to choose the most optimal solution with scalable aand redundancy (bare metal servers is not problem) Hi I have 1 director and ~8 dovecot nodes. I thinking about Solr cluster beacuse one server solr probably is not enough. I thinking about SolrCloud Mode but I don't know if it will work with Dovecot And if not SolrCloud Mode, then what? I don't have much experience in Solr clustering and I want to choose the most optimal solution with scalable aand redundancy (bare metal servers is not problem)

1 0

Dovecot and SNI
by steffan＠hldns.com 13 Mar '24

13 Mar '24

I have an old CentOS 7 server using dovecot 2.2.36 and OpenSSL 1.0.2k-fips that’s been fine for quite some time. Recently I started getting complaints related to SNI. I test with this: openssl s_client -connect mail.domain.com:993 -crlf -quiet On macOS using OpenSSL LibreSSL 3.3.6 I test and get the default dovecot domain “SomeWrongDomain.com” which causes issues. On Oracle Linux 9 using OpenSSL 3.0.7 I get the correct response for the domain “mail.domain.com” What could cause this? Thank you, Steffan Cline steffan(a)hldns.com<mailto:steffan@hldns.com> 602-793-0014 I have an old CentOS 7 server using dovecot 2.2.36 and OpenSSL 1.0.2k-fips that’s been fine for quite some time. Recently I started getting complaints related to SNI. I test with this: openssl s_client -connect mail.domain.com:993 -crlf -quiet On macOS using OpenSSL LibreSSL 3.3.6 I test and get the default dovecot domain “SomeWrongDomain.com” which causes issues. On Oracle Linux 9 using OpenSSL 3.0.7 I get the correct response for the domain “mail.domain.com” What could cause this? Thank you, Steffan Cline steffan(a)hldns.com 602-793-0014

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quota plugin with virtual user
by noemi 13 Mar '24

13 Mar '24

Hi, I'm having some problems after activating the quota plugin: I followed the guide from the doc[0] but I'm having problems with some virtual user. I understand that,with my conf,the quota plugin check the limit of a user and then tell postfix to accept/discard the mail. i have some users under my main domain [conf in /etc/passwd] and some virtual user/domains [conf in virtusertable/virtdomains as files in postfix]. the virtual users use their local user for the login, so dovecot doesn't know they are virtual. I think the problem is here, because it is clear that the quota-status check is made by dovecot using the virtual user and not the local user[1]. understanding the problem doesn't help me in the resolution [other than burn everything and rebuild with a single management for local/virtual users using a db] but i will prefer a more soft approach. any help? my complete conf below[2] thanks, noemi [0] https://blog.sys4.de/postfix-dovecot-mailbox-quota-en.html [1] where the virtual user is mail(a)virtdomain.com and the local user is mail_virtdomain the check is done to user 'mail', thus returning a error: Nov 16 06:36:09 quota-status(other-user)<129776><OOwwMv+3VWXw+gEAKobZ8Q>: Error: Failed to lookup user mail(a)virtdomain.com: Mail access for users with UID 8 not permitted (see first_valid_uid in config file, uid from userdb lookup). [2] # 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 6.1.0-10-amd64 x86_64 Debian 11.7 zfs # Hostname: mail-ng.pangea.org auth_mechanisms = plain login auth_username_format = %Ln default_client_limit = 3000 disable_plaintext_auth = no first_valid_uid = 8 log_path = /var/log/mail.log mail_location = maildir:/home/%n/Maildir mail_plugins = " quota" 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 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 } plugin { quota = maildir:User quota quota_exceeded_message = Quota exceeded, please go to https://laweb.pangea.org/contacte/ for instructions on how to fix this. quota_grace = 10%% quota_max_mail_size = 100M quota_status_nouser = DUNNO quota_status_overquota = 552 5.2.2 Mailbox is full and cannot receive any more emails quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u sieve = file:~/sieve/;active=~/.dovecot.sieve sieve_user_log = /var/log/sieve.log sieve_vacation_send_from_recipient = yes } protocols = " imap lmtp sieve pop3" service auth { unix_listener /var/spool/postfix/private/dovecot-auth { group = postfix mode = 0660 user = postfix } } service imap-login { process_limit = 1024 service_count = 100 } service imap { process_limit = 1024 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { process_limit = 1024 service_count = 0 } service pop3 { process_limit = 1024 } service quota-status { client_limit = 1 executable = quota-status -p postfix inet_listener { address = 127.0.0.1 port = 7777 } } service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { mode = 0666 user = vmail } user = dovecot } ssl_cert = </etc/letsencrypt/live/mail-ng.pangea.org/fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { driver = passwd } protocol imap { mail_max_userip_connections = 40 mail_plugins = " quota imap_quota" } protocol lmtp { mail_plugins = " quota sieve" }

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