[Mailman-Users] bounce notification to owner from non members?

[Richard Damon]

On 7/28/18 3:02 AM, Adam Morris wrote:
> Hi all,
> I receive about 8 bounce messages a day for one of my lists from
> people trying to post to it who aren't members.
> The list is set up as private so not sure how these spammers find it.
> I've been to the bounce page but can't work out how to stop these
> messages but allow bounce messages from members?
> TIA

Is it a HOLD message? If so then on the Sender Filter page you want to
make the non-member action be discard. If you make it Reject, then you
will see a bounce message if the spam message and a bad from address
(which it normally will have), also if you use reject then if the
message has a faked from address that is actually valid, you are
committing back-scatter and might get your list black-listed.

It would be nice if Mailman could tell the MTA as it was receiving the
message that it wasn't acceptable so it could be rejected then, but
since it generally can't, you need to discard spam, not reject it.

-- 
Richard Damon