[Mailman-Users] Challenge/response

[vancleef at lostwells.net]

> 
> I have a client who is concerned about his list subscriber addresses being
> spoofed. In other words someone who knows the addresses of people on the
> list can set up a mail server and spoof the subscriber so he can post nasty
> things to the list. He would like to set up a challenge/response mechanism
> so that when xyz at domain.com posts to the list, xyz at domain.com gets sent a
> copy of the message and must confirm that he/she was the sender before it
> gets posted. I don¹t see any configuration in Mailman for this. Is it
> possible?
> 
Challenge-response is a well-known spam relay issue, and very
undesirable.   Mailman privacy options allow you to force moderation
of mail purportedly coming from specific addresses  You should also 
investigate methods using your MTA or adding a filter to the mailman 
address input, and not even think about challenge-response.  

Hank