[Mailman-Users] Bogus mail to list from JavaMail.yahoo

[Mark Dale]

Hi All,

This may be a Postfix issue rather than a Mailman one, but the Mailman
post log (snip below) is showing some relevant info, so here goes.

This morning there was a legitimate post to a list from a subscriber
with a Gmail account.

Shortly after, there was a deluge of bogus posts (one every minute)
repeating the same email to the list purporting to come from the same
address.

The Mailman "post" logs below show the original at 13:43 with the
google.com ID, and the following bogus messages all with a yahoo.com ID

This appears to be happening to only the one list on the server.

If anyone could shed some light on this, or point me in the right
direction, it'd be much appreciated.

Regards,
Mark


Mar 06 13:43:12 2019 (21321) post to redacted-listname from
john.citizen at gmail.com, size=18763,
message-id=<0000000000000aa0c9058371592c at google.com>, success

Mar 06 13:44:09 2019 (21321) post to redacted-listname from
john.citizen at gmail.com, size=16906,
message-id=<1951431589.1505.1551897769010.JavaMail.yahoo at tardis008.cal.bf1.yahoo.com>,
success

Mar 06 13:45:09 2019 (21321) post to redacted-listname from
john.citizen at gmail.com, size=16896,
message-id=<1838256988.2441.1551897771539.JavaMail.yahoo at tardis064.cal.bf1.yahoo.com>,
success

Mar 06 13:46:06 2019 (21321) post to redacted-listname from
john.citizen at gmail.com, size=16889,
message-id=<574641303.2211.1551897775604.JavaMail.yahoo at tardis001.cal.bf1.yahoo.com>,
success

... and on and on ...