Running Ubuntu 16.04.6 LTS      
kernel version:     4.4.0-179-generic

I've not updated the server as in the past doing that broke Mailman

over the past few days mailman just decided to stop working. Rebooting has
not helped. Logfiles show

/var/log/mailman# more qrunner
Jun 04 06:25:02 2020 (1884) RetryRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1881) NewsRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1882) OutgoingRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1880) IncomingRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1883) VirginRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1879) CommandRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1877) ArchRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1878) BounceRunner qrunner caught SIGHUP.  Reopening
logs.
Jun 04 06:25:02 2020 (1876) Master watcher caught SIGHUP.  Re-opening log
files.

My mail.err shows lots of these entries:
Jun  5 05:05:01 mahavihara postfix/smtps/smtpd[26213]: warning:
unknown[52.185.149.198]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  5 05:05:01 mahavihara postfix/smtps/smtpd[26213]: lost connection after
AUTH from unknown[52.185.149.198]
Jun  5 05:05:01 mahavihara postfix/smtps/smtpd[26213]: disconnect from
unknown[52.185.149.198] ehlo=1 auth=0/1 commands=1/2
Jun  5 05:05:43 mahavihara postfix/smtps/smtpd[26698]: connect from
unknown[52.185.149.198]
Jun  5 05:05:48 mahavihara postfix/smtps/smtpd[26698]: warning:
unknown[52.185.149.198]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  5 05:05:52 mahavihara postfix/smtps/smtpd[26698]: lost connection after
AUTH from unknown[52.185.149.198]

went through this
https://www.gnu.org/software/mailman/mailman-install/troubleshooting.html 

please advise. Thank you!

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