I am attempting to figure out the best way to set up an auto-response
(bounce, in a manner of speaking) triggered by sender domain, in order to
facilitate not just rejecting specific domains, but auto-answering mail from
them.
The situation is as follows: My company receives mail from vary large number
of different domains, most legitimate, but some notorious spammers, and some
a combo of both. The problem is that I am uncomfortable just adding a domain
to "badmailfrom", as I have to be really careful blocking out entire domains
lest I block out some legitimate users. badmailfrom only provides an smtp
rejection, and I cannot guarantee that an end-user could figure out what
happened. Therefore, I would like to maintain a list of domains a la
badmailfrom, but rather than doing an smtp reject, an autoreponse would
result (your mail has been reject because <blah>, please contact <blah> etc.
etc. ). This way, legitimate users on "banned" domains would have an
opportunity to notify us and get unbanned. It seems simple on the surface,
but most every filter I have found so far relies on RBLs (love em, but far
too arbitrary for this task), or receiver address/domain (it's all coming to
the same domain, I need to filter by sender domain). I am sure there must be
a fairly simple way to complete this, but I'm not having a lot of luck so
far. Any help/thoughts would be greatly appreciated. Thanks in advance.
Mike Culbertson
sysadmin
P.S. The qmail boxes in question are acting as relays only, I am trying to
avoid using procmail to filter all deliveries, as 99.9% is sent onwards to
another host, not locally. Don't want to double-process the mail if I don't
have to, rather have qmail handle all the filtering alone if possible.
