June 2026 - Mailman-users - lists.mailman3.org

postfix_lmtp doesn't exist
by Flo June 16, 2026

June 16, 2026

Dear all, I am running Debian Trixie with Postfix. Now I want to install Mailman via virtualenv. All looks fine so far but when I insert transport_maps = hash:/home/mailman_var/data/postfix_lmtp local_recipient_maps = hash:/home/mailman_var/data/postfix_lmtp relay_domains = hash:/home/mailman_var/data/postfix_domains to main.cf I get an error when sending emails. Understandable, because there is no postfix_lmtp available. When will it be created? I haven't observed any error at the installation up to that point. Thanks for your help, Flo PS: I changed var_dir to /home/mailman_var because I thought data should be better at the home partition, especially as I was afraid they might take a lot of space and there is not a lot available at the root partition. I don't know if this is a good idea.

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Possibly more a Postfix question than a mailman one one but...
by Paul Tomblin June 15, 2026

June 15, 2026

I want to limit the number of simultanous connections for one domain that I send email to. According ot what i've managed to find on-line, I need to put in a transport map in Postfix for that. But Mailman appears to already be using the transport map for routing incoming mail: > > transport_maps = > hash:/opt/mailman/mm/var/data/postfix_lmtp > local_recipient_maps = > proxy:unix:passwd.byname, $alias_maps, hash:/opt/mailman/mm/var/data/postfix_lmtp > relay_domains = > hash:/opt/mailman/mm/var/data/postfix_domains Can i append or pre-pend another transport file in the transport_maps listing and put in the entry for this domain that's been bouncing people off my list because of too many simultaneous connections? -- Paul Tomblin

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Why aren't I getting bounce texts any more?
by Paul Tomblin June 9, 2026

June 9, 2026

I swear I used to get the exactly text of the bounce message when email to a list member bounced, but I'm not seeing it any more. Is there a setting I've overlooked? I've turned on "*Notify owner on bounce increment"* which was off for some reason. I just had 24 users bounced off a mailing list this morning for excessive bounces, and I can only think their ISP suddenly took exception to my setup somehow. It would have been nice to have to a warning when the first bounce happened. -- Paul Tomblin

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Generic Cannot connect to SMTP server error, no outgoing smtp connections
by Stefan Bauer June 4, 2026

June 4, 2026

Dear Users, I'm debugging since several days a mailman3 installation and can not get mailman to deliver mails to list members. Mailman logs Cannot connect to SMTP server, however the server is listening, but i see no connection attempts. In queue/out, i see changing files all the time: drwxrwx--- 2 mailman nogroup 4.0K Jun 4 13:04 . drwxr-xr-x 15 mailman nogroup 4.0K Jun 4 08:22 .. -rw-rw---- 1 mailman nogroup 6.1K Jun 4 12:22 1780575734.9281623+0ad5f564c9fc5f27750a09b948f3480d9047cbaa.pck.tmp -rw-rw---- 1 mailman nogroup 6.1K Jun 4 13:04 1780578250.2070453+752ca17af5c64af7aab5f0fc61ac2ea28b091825.bak 038b90c74d8d:/opt/mailman/var/queue/out# ls -alh total 24K drwxrwx--- 2 mailman nogroup 4.0K Jun 4 13:04 . drwxr-xr-x 15 mailman nogroup 4.0K Jun 4 08:22 .. -rw-rw---- 1 mailman nogroup 6.1K Jun 4 12:22 1780575734.9281623+0ad5f564c9fc5f27750a09b948f3480d9047cbaa.pck.tmp -rw-rw---- 1 mailman nogroup 6.1K Jun 4 13:04 1780578250.7552953+6350a013583657c317c0a64b9cf2039dca645974.bak 038b90c74d8d:/opt/mailman/var/queue/out# SMTP/DEBUG-Log is flooded with over and over same attempts: ==> /opt/mailman/core/var/logs/smtp.log <== Jun 04 13:04:46 2026 (26) Using agent: <mailman.mta.deliver.Deliver object at 0x79ed98555310> Jun 04 13:04:46 2026 (26) IndividualDelivery to: cubewerk(a)gmail.com ==> /opt/mailman/core/var/logs/debug.log <== Jun 04 13:04:46 2026 (31) [VirginRunner] starting oneloop Jun 04 13:04:46 2026 (31) [VirginRunner] ending oneloop: 0 Jun 04 13:04:46 2026 (26) [OutgoingRunner] finishing filebase: 1780578286.711373+091038a49a00758fdd2ba5265714e2fa31ea4843 Jun 04 13:04:46 2026 (26) [OutgoingRunner] doing periodic Jun 04 13:04:46 2026 (26) [OutgoingRunner] committing transaction Jun 04 13:04:46 2026 (26) [OutgoingRunner] checking short circuit Jun 04 13:04:46 2026 (26) [OutgoingRunner] ending oneloop: 1 Jun 04 13:04:46 2026 (26) [OutgoingRunner] starting oneloop Jun 04 13:04:46 2026 (26) [OutgoingRunner] processing filebase: 1780578286.7329357+2ec378350ee99307adc287fc8727fb9120a385d3 Jun 04 13:04:46 2026 (26) [OutgoingRunner] processing onefile Jun 04 13:04:46 2026 (26) [outgoing] <function deliver at 0x79ed98b85d00>: <gxZS.-LyKCSHn9UWsyVepCakA9g(a)flTQyy2_BUC0KFtMliiieCkabFXP1SdNnP1xIyNQp-k.xz> ==> /opt/mailman/core/var/logs/smtp.log <== Jun 04 13:04:46 2026 (26) Using agent: <mailman.mta.deliver.Deliver object at 0x79ed98a43bf0> Jun 04 13:04:46 2026 (26) IndividualDelivery to: cubewerk(a)gmail.com If i restart the docker-core container, i see a single time the error "Cannot connect to SMTP server 172.17.0.1 on port 587". my config: [runner.retry] sleep_time: 10s [webservice] hostname: 172.18.0.2 port: 8001 admin_user: restadmin admin_pass: restpass configuration: /etc/gunicorn.cfg [mta] incoming: mailman.mta.postfix.LMTP outgoing: mailman.mta.deliver.deliver lmtp_host: 172.18.0.2 lmtp_port: 8024 smtp_host: 172.17.0.1 smtp_port: 587 smtp_user: smtp_pass: smtp_secure_mode: starttls smtp_verify_hostname: false smtp_verify_cert: false configuration: /etc/postfix-mailman.cfg [logging.smtp] level: debug [logging.error] level: debug [logging.debug] level: debug [archiver.mail_archive] enable: no configuration: /opt/mailman/mail_archive_dummy.cfg [archiver.hyperkitty] class: mailman_hyperkitty.Archiver enable: yes configuration: /etc/mailman-hyperkitty.cfg Any helps is greatly appreciated. thank you. Stefan

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