[Mailman-Users] Which user is harvesting sender emails?

[Richard Hipp]

Mailman 2.1.20 is being used for the mailing list for an open-source
project.  There are 522 members.
(http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/fossil-users)

Whenever anyone posts to this list, somebody (presumable one of the
522 subscribers) is capturing the sender email and the subject line
and sending multiple porn-spam replies to the sender from an off-list
email address.  The question:  How to figure out which of the 522
subscribers is doing this so that they can be ejected from the list?

I tried making the list anonymous, but that was met with howls of
protest from the legitimate list members.  That is not a viable
solution.

It would be great if there were some way to send a message where the
>From field of each recipient was slightly different, and different in
a way that was traceable back to the list member.  That would allow me
to identify the leaker.

Other suggestions?

-- 
D. Richard Hipp
drh at sqlite.org