Hi Mark,
That's a misleading message. It's been improved by https://gitlab.com/mailman/mailman/-/merge_requests/1362, however usually the underlying issue is inability to access a header or footer template when decorating the message. This in turn is most likely >caused by some template(s) in Mailman's var/templates/ directory being owned by
rootor some other non-mailman user and not readable by the Mailman user which in turn most likely results from runningmailman import21as root.
You are my hero! After "patching" the outgoing.py file with the error messages I got
Aug 06 09:52:51 2025 (443278) Cannot connect to SMTP server 127.0.0.1 on port 25: HTTPSConnectionPool(host='lists.example.com', port=443): Max retries exceeded with url: /postorius/api/templates/list/hpc-admintreffen-info.lists.example.com/list:member:regular:footer (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1006)')))
And was shocked. Why is there an SSL Certificate Error? Why can't python requests verify the certificate?
So I googled a bit and found, that we can fix this be editing the cacert.pem of certifi. I did, but the error was still there. So I checked my https VHost (Apache btw) and there was a wrong chain in it. Oof. An error, that a browser does not see, but any ssl client. I fixed it and boom - everything works again.
Thank you again and thank you Stephen for trying to resolve the problem 😊
-- 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@itc.rwth-aachen.de www.itc.rwth-aachen.de
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-----Original Message----- From: Mark Sapiro <mark@msapiro.net> Sent: Tuesday, August 5, 2025 6:19 PM To: mailman-users@mailman3.org Subject: [MM3-users] Re: Held messages not delivered after approval
On 8/5/25 02:06, Krinetzki, Stephan wrote:
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:
That's a misleading message. It's been improved by https://gitlab.com/mailman/mailman/-/merge_requests/1362, however usually the underlying issue is inability to access a header or footer template when decorating the message. This in turn is most likely caused by some template(s) in Mailman's var/templates/ directory being owned by root or some other non-mailman user and not readable by the Mailman user which in turn most likely results from running mailman import21 as root.
Bottom line - check that all sub-directories and files in Mailman's var/templates/ directory are searchable and readable by the Mailman user.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
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