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Issue Mailman - Server not connected

ilsuky

New Pleskian
Server: CentOS Linux release 7.9.2009
Mailman: 2.1.15
Plesk: 18.0.56

Hi,

after we updated the linux (only yum update), mailman doesnt work anymore, service is running:

Redirecting to /bin/systemctl status mailman.service
mailman.service - GNU Mailing List Manager
Loaded: loaded (/usr/lib/systemd/system/mailman.service; enabled; vendor preset: disabled)
Drop-In: /usr/lib/systemd/system/mailman.service.d
└─respawn.conf
Active: active (running) since Mon 2023-10-30 15:12:50 CET; 6 days ago
Main PID: 20315 (mailmanctl)
CGroup: /system.slice/mailman.service
├─20315 /usr/bin/python2 /usr/lib/mailman/bin/mailmanctl -s start
├─20316 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=ArchRunner:0:1 -s
├─20317 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=BounceRunner:0:1 -s
├─20318 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=CommandRunner:0:1 -s
├─20319 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=IncomingRunner:0:1 -s
├─20320 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=NewsRunner:0:1 -s
├─20321 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=OutgoingRunner:0:1 -s
├─20322 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=VirginRunner:0:1 -s
└─20323 /usr/bin/python2 /usr/lib/mailman/bin/qrunner --runner=RetryRunner:0:1 -s

Send mail to Maillist, it will proccessed the Mail:
Nov 04 10:31:17 2023 (20321) <[email protected]> smtp to all_worker for 1845 recips, completed in 87.208 seconds

But in the smtp-failure log i can see:
Nov 04 10:46:52 2023 (20721) delivery to [email protected] failed with code -1: Server not connected
Nov 04 10:46:52 2023 (20721) delivery to [email protected] failed with code -1: Server not connected
Nov 04 10:46:52 2023 (20721) delivery to [email protected] failed with code -1: Server not connected
Nov 04 10:46:52 2023 (20721) delivery to [email protected] failed with code -1: Server not connected
Nov 04 10:46:52 2023 (20721) delivery to [email protected] failed with code -1: Server not connected

Postfix / Mailman is running normaly. No errors in error log.
If i try to send mails with a script (python) it works.

Whitelist. Entries for 127.0.0.1 and ::1/128 exists.

selinux is disabled, firewall rules are set.

As I said, everything worked before, but not anymore.
 
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