Hello Mark,
So we have only one particular mailing list having this issue. The out-runner keeps creating new .pck and .bak files endlessly whenever an email gets sent to this mailing list. Other mailing lists are unaffected and functioning normally. We created multiple similar mailing lists using the same settings, and they all work as expected.
We tried deleting this mailing list and recreating a new one, but no luck. We also tried restarting mailman, and the issue persists. When looking at the mailman.log, messages sent to this problematic mailing list are accepted and archived successfully without a noticeable issue.
In the smtp.log, also no errors are found except one line "Connection lost during _handle_client()", but this is true for all other mailing lists.
A normal mailing list will behave like:
....... Jun 15 14:04:29 2020 (23) Connection lost during _handle_client() Jun 15 14:04:35 2020 (25) <CALJL-SHz-nMashdjka=amhBhXhasdjkl_PK5QHGt3CQEa0v2hg@example.com> smtp to xx@lists.mailmanexample.com for 1 recips, completed in 1.0880396366119385 seconds Jun 15 14:04:35 2020 (25) <CALJL-SHz-nMasdhjk=amhBhXeO9iNwo_PK5QHGasdjkjklg@example.com> post to xx@lists.mailmanexample.com from sender@example.com, 2439 bytes
However, the mailing list having issue will just stop at: ....... Jun 15 14:04:29 2020 (23) Connection lost during _handle_client()
But this mailing list does response to subscription, sending confirmation, etc.
We're really lost at this point, any idea on what might be causing the issue? Would corrupted entries in the database causing this? We're using MySQL database for mailman.
Thank you very much!
Sincerely, Rongxin