Search results for "Cannot connect to SMTP server"

[MM3-users] Re: Held messages not delivered after approval

by Krinetzki, Stephan

Hi Mark, Hi Stephen, so I updated now my configuration a bit. The logging is now default: [logging.archiver] datefmt: %b %d %H:%M:%S %Y [logging.archiver] format: %(asctime)s (%(process)d) %(message)s [logging.archiver] level: info [logging.archiver] path: mailman.log [logging.archiver] propagate: no [logging.bounce] datefmt: %b %d %H:%M:%S %Y [logging.bounce] format: %(asctime)s (%(process)d) %(message)s [logging.bounce] level: info [logging.bounce] path: bounce.log [logging.bounce] propagate: no [logging.config] datefmt: %b %d %H:%M:%S %Y [logging.config] format: %(asctime)s (%(process)d) %(message)s [logging.config] level: info [logging.config] path: mailman.log [logging.config] propagate: no [logging.database] datefmt: %b %d %H:%M:%S %Y [logging.database] format: %(asctime)s (%(process)d) %(message)s [logging.database] level: warn [logging.database] path: mailman.log [logging.database] propagate: no [logging.debug] datefmt: %b %d %H:%M:%S %Y [logging.debug] format: %(asctime)s (%(process)d) %(message)s [logging.debug] level: info [logging.debug] path: debug.log [logging.debug] propagate: no [logging.error] datefmt: %b %d %H:%M:%S %Y [logging.error] format: %(asctime)s (%(process)d) %(message)s [logging.error] level: info [logging.error] path: mailman.log [logging.error] propagate: no [logging.fromusenet] datefmt: %b %d %H:%M:%S %Y [logging.fromusenet] format: %(asctime)s (%(process)d) %(message)s [logging.fromusenet] level: info [logging.fromusenet] path: mailman.log [logging.fromusenet] propagate: no [logging.gunicorn] datefmt: %b %d %H:%M:%S %Y [logging.gunicorn] format: %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s" [logging.gunicorn] level: info [logging.gunicorn] path: mailman.log [logging.gunicorn] propagate: no [logging.http] datefmt: %b %d %H:%M:%S %Y [logging.http] format: %(asctime)s (%(process)d) %(message)s [logging.http] level: info [logging.http] path: mailman.log [logging.http] propagate: no [logging.locks] datefmt: %b %d %H:%M:%S %Y [logging.locks] format: %(asctime)s (%(process)d) %(message)s [logging.locks] level: info [logging.locks] path: mailman.log [logging.locks] propagate: no [logging.mischief] datefmt: %b %d %H:%M:%S %Y [logging.mischief] format: %(asctime)s (%(process)d) %(message)s [logging.mischief] level: info [logging.mischief] path: mailman.log [logging.mischief] propagate: no [logging.plugins] datefmt: %b %d %H:%M:%S %Y [logging.plugins] format: %(asctime)s (%(process)d) %(message)s [logging.plugins] level: info [logging.plugins] path: plugins.log [logging.plugins] propagate: no [logging.root] datefmt: %b %d %H:%M:%S %Y [logging.root] format: %(asctime)s (%(process)d) %(message)s [logging.root] level: info [logging.root] path: mailman.log [logging.root] propagate: no [logging.runner] datefmt: %b %d %H:%M:%S %Y [logging.runner] format: %(asctime)s (%(process)d) %(message)s [logging.runner] level: info [logging.runner] path: mailman.log [logging.runner] propagate: no [logging.smtp] datefmt: %b %d %H:%M:%S %Y [logging.smtp] every: $msgid smtp to $listname for $recip recips, completed in $time seconds [logging.smtp] failure: $msgid delivery to $recip failed with code $smtpcode, $smtpmsg [logging.smtp] format: %(asctime)s (%(process)d) %(message)s [logging.smtp] level: info [logging.smtp] path: smtp.log [logging.smtp] propagate: no [logging.smtp] refused: $msgid post to $listname from $sender, $size bytes, $refused failures [logging.smtp] success: $msgid post to $listname from $sender, $size bytes [logging.subscribe] datefmt: %b %d %H:%M:%S %Y [logging.subscribe] format: %(asctime)s (%(process)d) %(message)s [logging.subscribe] level: info [logging.subscribe] path: mailman.log [logging.subscribe] propagate: no [logging.task] datefmt: %b %d %H:%M:%S %Y [logging.task] format: %(asctime)s (%(process)d) %(message)s [logging.task] level: info [logging.task] path: mailman.log [logging.task] propagate: no [logging.vette] datefmt: %b %d %H:%M:%S %Y [logging.vette] format: %(asctime)s (%(process)d) %(message)s [logging.vette] level: info [logging.vette] path: mailman.log [logging.vette] propagate: no Further, I edited the logrotate: /var/log/mailman/mailman-logs/*.log { missingok daily compress delaycompress nomail notifempty rotate 14 dateext su mailman mailman olddir /var/log/mailman/mailman-logs/oldlogs postrotate /bin/kill -HUP `cat /opt/mailman/var/master.pid 2>/dev/null` 2>/dev/null || true # Don't run "mailman3 reopen" with SELinux on here in the logrotate # context, it will be blocked /opt/mailman/mailman-venv/bin/mailman reopen >/dev/null 2>&1 || true endscript } It is now more like the Fedora one and seems to be better. Now in the mailman.log I see the HOLD messages and the approved messages. The smtp.log logs just the incoming Mail, which seems to be fine. So, here a complete Trace: smtp.log: Aug 05 10:18:40 2025 (217984) Available AUTH mechanisms: LOGIN(builtin) PLAIN(builtin) Aug 05 10:18:40 2025 (217984) Peer: ('127.0.0.1', 57074) Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) handling connection Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) >> b'LHLO lists.rwth-aachen.de' Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) >> b'MAIL FROM:<SENDER> SIZE=15187' Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) sender: SENDER Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) >> b'RCPT TO:<stephansmodliste(a)lists.example.com>' Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) recip: stephansmodliste(a)lists.example.com Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) >> b'DATA' Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) >> b'QUIT' Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) connection lost Aug 05 10:18:40 2025 (217984) ('127.0.0.1', 57074) Connection lost during _handle_client() The mailman.log: Aug 05 10:18:40 2025 (217983) HOLD: stephansmodliste(a)lists.example.com post from SENDER held, message-id=<b93e46d8342f42039c99e1d2d036c711@SENDERDOMAIN>: The message is not from a list member Aug 05 10:21:04 2025 (218015) held message approved, message-id: <b93e46d8342f42039c99e1d2d036c711@SENDERDOMAIN> [05/Aug/2025:10:21:04 +0200] "POST /3.1/lists/stephansmodliste(a)lists.example.com/held/211056 HTTP/1.1" 204 0 "-" "GNU Mailman REST client v3.3.5" [05/Aug/2025:10:21:04 +0200] "GET /3.1/lists/stephansmodliste(a)lists.example.com/held?count=0&page=1 HTTP/1.1" 200 90 "-" "GNU Mailman REST client v3.3.5" [05/Aug/2025:10:21:04 +0200] "GET /3.1/lists/stephansmodliste(a)lists.example.com/held?count=10&page=1 HTTP/1.1" 200 90 "-" "GNU Mailman REST client v3.3.5" [05/Aug/2025:10:21:04 +0200] "GET /3.1/lists/stephansmodliste(a)lists.example.com/requests/count?token_owner=moderator HTTP/1.1" 200 73 "-" "GNU Mailman REST client v3.3.5" [05/Aug/2025:10:21:04 +0200] "GET /3.1/lists/stephansmodliste(a)lists.example.com/held/count HTTP/1.1" 200 73 "-" "GNU Mailman REST client v3.3.5" Aug 05 10:21:05 2025 (217986) Cannot connect to SMTP server localhost on port 25 The last error is a very often in the mailman.log: Aug 05 09:46:12 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:46:13 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 09:46:13 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 09:46:14 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 09:46:24 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 09:50:22 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 09:50:24 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:53:30 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 09:55:01 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 09:55:01 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:55:09 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 09:57:44 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 09:57:46 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:50 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:52 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:52 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:53 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:53 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 09:58:53 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:01:18 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:02:02 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 10:07:11 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 10:10:36 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:11:35 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:16:04 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:16:05 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:16:07 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:16:58 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:17:42 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:18:30 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:20:13 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:21:05 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:08 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:08 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:31 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:37 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:44 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:47 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:50 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:28:57 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:29:22 2025 (217988) Cannot connect to SMTP server localhost on port 25 Aug 05 10:29:40 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:29:41 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:30:37 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:30:37 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:30:50 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:31:15 2025 (217987) Cannot connect to SMTP server localhost on port 25 Aug 05 10:33:42 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:33:53 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:34:27 2025 (217985) Cannot connect to SMTP server localhost on port 25 Aug 05 10:34:28 2025 (217986) Cannot connect to SMTP server localhost on port 25 Aug 05 10:38:25 2025 (230250) Cannot connect to SMTP server lists.example.com on port 25 Aug 05 10:38:25 2025 (230247) Cannot connect to SMTP server lists.example.com on port 25 Even after changing the smtp_host in mailman.cfg this error appears randomly. Sadly the mail does not get delivered. -- Stephan Krinetzki IT Center Gruppe: Anwendungsbetrieb und Cloud Abteilung: Systeme und Betrieb RWTH Aachen University Seffenter Weg 23 52074 Aachen Tel: +49 241 80-24866 Fax: +49 241 80-22134 krinetzki(a)itc.rwth-aachen.de www.itc.rwth-aachen.de Social Media Kanäle des IT Centers: https://blog.rwth-aachen.de/itc/ https://www.facebook.com/itcenterrwth https://www.linkedin.com/company/itcenterrwth https://twitter.com/ITCenterRWTH https://www.youtube.com/channel/UCKKDJJukeRwO0LP-ac8x8rQ -----Original Message----- From: Mark Sapiro <mark(a)msapiro.net> Sent: Tuesday, August 5, 2025 12:51 AM To: mailman-users(a)mailman3.org Subject: [MM3-users] Re: Held messages not delivered after approval On 8/4/25 00:21, Krinetzki, Stephan wrote: >> >> And for every one of those shunted messages there should be an exception with traceback logged in mailman.log. Those tracebacks should be helpful. > > If there were any. Maybe the "debug" level should be "info". But for which logs? The standard logging levels from lowest to highest are debug info warning error critical Whatever level is set for a log results in all messages of that level or higher being logged. I.e. if the log's level is debug, all messages for that log of any level should be logged. For every shunted message, a message like `SHUNTING: <file name without the .pck extention>` preceded by the exception and traceback is logged to error.log with level error. See https://gitlab.com/mailman/mailman/-/blob/master/src/mailman/core/runner.py… > Maybe the restart at night after the lograte maybe the issue. As I said before, blindly restarting Mailman is a bad idea. On servers that I maintain, I always verify that all queues are empty before stopping or restarting Mailman. If necessary, I'll kill the incoming runner and wait for the out queue to empty and then stop mailman. If you want to do this daily, you could automate that., e.g. ``` if queues empty: restart Mailman else: when in queue is empty, sigterm incoming runner when out queue is empty, stop Mailman when Mailman stopped, start Mailman ``` The stop/start is needed because a simple restart at that point won't start the sigtermed incoming runner. -- Mark Sapiro <mark(a)msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan _______________________________________________ Mailman-users mailing list -- mailman-users(a)mailman3.org To unsubscribe send an email to mailman-users-leave(a)mailman3.org https://lists.mailman3.org/mailman3/lists/mailman-users.mailman3.org/ Archived at: https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message… This message sent to krinetzki(a)itc.rwth-aachen.de

2 months, 4 weeks

[MM3-users] Re: Cannot connect to SMTP server

by Mark Sapiro

On 8/13/22 15:14, mkummini(a)cmi.ac.in wrote: > > However, I get the following line each time I do a restart > Aug 14 03:19:57 2022 (4096859) Cannot connect to SMTP server localhost on port 587 > I tried to specify the name of the postfix server, though it runs on the same machine as mailman3, and the different ports : 25, 465 and 587; they all raise the same error. You only see this message once at startup because it is only issued once until there is a successful delivery. This error can occur for reasons other than an inability to connect to the smtp server. In particular, if there are errors in decorating the message with a header and/or a footer because of permissions or other problems in retrieving a list:member:regular:header or list:member:regular:footer template, this will occur. Have you put templates in Mailman's var/templates directory (possibly named /var/lib/mailman/templates in the debian package). If so, can the Mailman user (I think `list` in a debian package) find and read them? -- Mark Sapiro <mark(a)msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

3 years, 2 months

[MM3-users] Re: "Cannot connect to SMTP server localhost on port 25"

by Mark Sapiro

On 9/18/19 2:29 PM, Manos Pitsidianakis wrote: > > Στις 2019-09-18 19:12, Mark Sapiro έγραψε: >> Is only one list affected, and is it all messages from this list or only >> some? > > Just two messages from this certain list. Subsequent messages and other > activity seems to work properly There should be entries in the mailman.log for each shunted message listing the exception with a traceback and the fact that the message was shunted. What are these entries? > Well there is no connection to postfix at all when the runner starts and > the "Cannot connect to SMTP server" log shows up. Otherwise I'd have > seen something in the postfix logs or tcpdumps in localhost. The "Cannot connect to SMTP server" log message should not occur immediately on startup unless there are queued messages. That log message should only occur on an attempt to actually send a message. -- Mark Sapiro <mark(a)msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

6 years, 1 month

[MM3-users] Re: "Cannot connect to SMTP server localhost on port 25"

by Manos Pitsidianakis

Thanks for the reply Mark, Στις 2019-09-21 16:19, Mark Sapiro έγραψε: > It's a stretch, but I suggest you examine the list membership and > remove > any invalid local addresses. There aren't any local addresses. > Also, look in the mail server's logs to see if you can see anything > about incoming connections being established and then dropped. Unfortunately no. Listening on all interfaces with tcpdump and there are no packets when mailman starts and the "Cannot connect to SMTP" log appears. It looks like there is no connection at all. Can I use a debugger to see exactly what happens in the runner?

6 years, 1 month

[MM3-users] Re: Cannot connect to SMTP server

by Mark Sapiro

On 8/13/22 15:57, Mark Sapiro wrote: > > Have you put templates in Mailman's var/templates directory (possibly > named /var/lib/mailman/templates in the debian package). If so, can the > Mailman user (I think `list` in a debian package) find and read them? I think that should be /var/lib/mailman3/templates in the debian package. Also, all that directory and all its subordinate directories and files should be user:group list:list. If you ever ran Mailman core as `root` and not as user `list`, this can create things that `list` can't read. See these threads: https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/…, https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/… and https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/… and perhaps others from this search https://lists.mailman3.org/archives/search?q=Cannot+connect+to+SMTP+server -- Mark Sapiro <mark(a)msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

3 years, 2 months

[MM3-users] Re: "Cannot connect to SMTP server localhost on port 25"

by Mark Sapiro

On 9/21/19 1:28 AM, Manos Pitsidianakis wrote: > > I cannot discern anything in the qfiles. It'd take some effort to > deanonymise them for posting here. > > I've had new posts in the list and they get stuck as well. It's a stretch, but I suggest you examine the list membership and remove any invalid local addresses. Also, look in the mail server's logs to see if you can see anything about incoming connections being established and then dropped. -- Mark Sapiro <mark(a)msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

6 years, 1 month

[MM3-users] "Cannot connect to SMTP server localhost on port 25"

by Manos Pitsidianakis

Hello, I've been getting "Cannot connect to SMTP server localhost on port 25" from runner "out" in mailman.log over some mails stuck in shunt queue, postfix logs show nothing when this happens, tcpdump on lo interface port 25 shows nothing. The log shows up when I start mailman, and then it seems not to show up again. This is my mailman.cfg's relevant parts: [mta] verp_confirmations: yes verp_personalized_deliveries: yes verp_delivery_interval: 1 incoming: mailman.mta.postfix.LMTP outgoing: mailman.mta.deliver.deliver lmtp_host: localhost lmtp_port: 8024 smtp_host: localhost smtp_port: 25 configuration: python:mailman.config.postfix I can do 'telnet localhost 25' just fine, including as mailman user. I can send and receive mail on my mail server. I tried making a test list and sent/received messages fine. smtp debug logs show "Using agent: <mailman.mta.deliver.Deliver object at 0x7fdd9793c940>" and "IndividualDelivery to: <email(a)address.tld>" on repeat, where the email address is one of the addresses of the shunted mails. version 3.2.2

6 years, 1 month

[MM3-users] Re: "Cannot connect to SMTP server localhost on port 25"

by Manos Pitsidianakis

Thank you for your prompt response Mark, Στις 2019-09-18 19:12, Mark Sapiro έγραψε: > Is only one list affected, and is it all messages from this list or > only > some? Just two messages from this certain list. Subsequent messages and other activity seems to work properly > Do some deliveries of the problem message succeed? > I think not, the IndividualDelivery lines list all all recipients (list is small so I was able to check) > Postfix can return a 421 status > and drop the connection if there are too many invalid local recipients, > although I don't know if this would apply in the VERP case. Well there is no connection to postfix at all when the runner starts and the "Cannot connect to SMTP server" log shows up. Otherwise I'd have seen something in the postfix logs or tcpdumps in localhost.

6 years, 1 month

[MM3-users] Re: "Cannot connect to SMTP server localhost on port 25"

by Manos Pitsidianakis

Thank you again for your reply, Mark. Στις 2019-09-18 21:53, Mark Sapiro έγραψε: > What are these entries? I have these log entries, are these what you were referring to? https://paste.debian.net/hidden/37d863f6/ > > The "Cannot connect to SMTP server" log message should not occur > immediately on startup unless there are queued messages. That log > message should only occur on an attempt to actually send a message. I think the problematic e-mails that cause this issue are stuck on the outgoing queue. Right now there are 2 pck files and one .bak in var/queue/out changing filenames repeatedly.

6 years, 1 month

[MM3-users] Re: Uncaught runner exception

by Stephen J. Turnbull

Wolfgang Bock via Mailman-users writes: > I tested port 25 with swaks ->mail to user on server: localhost > port 25 -> everything fine What is "swaks"? > Apr 07 12:09:21 2020 (28206) Cannot connect to SMTP server > localhost on port 25 Is it possible that Postfix is configured for TLS connections only? If so, it is probably listening on port 465 (the "submissions" port, AKA ssmtp and smtps) or (less likely) 587 (the "submission" port -- no trailing "s"). Mailman needs to be configured correctly for this. See https://mailman.readthedocs.io/en/latest/src/mailman/mta/docs/connection.ht… It's barely possible that Postfix is listening on port 25 but insists on TLS. But that's very unusual, and I think that would produce a SMTP error such as "Need STARTTLS" or "Need SASL" (which happen *after* the TCP connection is established) instead of "Cannot connect" (which suggests a TCP error before a connection is completed). > I have no idea what to do for solving my problems. That's when we're most of service. At least, I hope so! :-) Steve

5 years, 6 months

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