Jens Günther writes:
Already a while I get this type of error:
2023-08-26T08:21:59.517986+02:00 postfix/smtpd[2843414]: connect from unknown[192.168.176.6] 2023-08-26T08:21:59.522238+02:00 postfix/smtpd[2843414]: NOQUEUE: reject: RCPT from unknown[192.168.176.6]: 450 4.7.25 Client host rejected: cannot find your hostname, [192.168.176.6]; from=<$admin@mydomain.de> to=<$recipient> proto=ESMTP helo=<mailman-web>
and similar except for
from=<root@$mailman.mydomain.de> to=<root@localhost> proto=ESMTP [...] Where
- $admin@mydomain.de is set in MAILMAN_ADMIN_EMAIL (mm-web) and as site_owner in mailman-extra.cfg (mm-core) and as DEFAULT_FROM_EMAIL in settings_local.py (mm-web)
- $mailman.mydomain.de is set in SERVE_FROM_DOMAIN (mm-web)
The first one is probably a Django error. You can probably find a trace of it in the Mailman's mailman-web.log. The second one could be any number of things but I would guess for starters it's a cron report. That might show up in a cron.log or syslog or messages.
Sorry I can't be of more help.
Steve