On Jul 31, 2017, at 19:58, Mark Lindsay <mark@nervous.org> wrote:
The LMTP runner on my Mailman 3 install (3.1.0b4) has started silently crashing. The parent process and all of the other runners stay up. Nothing interesting seems to be written to the logs. I've been finding out about it when exim4 (running on the same server) starts sending out "retry timeout exceeded" bounce emails to list participants:
Ouch, that seems bad. ;)
I’m surprised there’s nothing in any of the logs. You might try bumping up the logging.smtp loggers level to debug and see if you get anything useful, although it may also be much more chatty. logging.smtp also controls mail.log which is used by aiosmtpd, the actual LMTP implementation.
Add this to your mailman.cfg file:
[logging.smtp] level: debug path: mailman.smtp
then restart Mailman, and tail the mailman.smtp file in the logging directory.
Cheers, -Barry