On Thu, Dec 08, 2016 at 02:58:24PM +0000, cmc wrote: > We have a server running Postfix, with mailing lists run by > Mailman, for a local domain. This server receives mail from an > upstream cloud-based server for all recipients not on the > cloud-based server (the idea being that any user not on the cloud > server is a mailing list).
Ouch. Ugly and wrong. > The mail is relayed to the mailing list > server via another internal postfix server. Mail that is sent to > users that don't exists and are not mailing lists ends up on the > relay server, as it gets rejected with 'user unknown' by the > mailing list server when Postfix sees that it is not in the > local_recipient_maps. This ends up clogging up the relay server as > it tried to deliver (mostly spam) back to the originators. I think > the best solution may be to have the mailing list server to accept > mail received via SMTP that it doesn't have a local_recipient_map > for, and then forward it to /dev/null, but I'm not quite sure how > to do this. Or perhaps there is a way on the relay server to delete > mail it gets a 550 unknown response for. > > Any suggestions as to the best way to do this? Both the frontend (MX host) and the backend (Mailman host) need to have complete address lists for the domain (or domains) involved. Then transport_maps on each host should route the mail for the other host's addresses to that host. It's easy enough to replicate the Mailman aliases to the MX host, but replicating the MX host's address list to the internal Mailman host might be more of a problem. (Or it might not ... we don't know how you configured it.) Anyway, there it is, that's what you have to do. -- http://rob0.nodns4.us/ Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
