Hi,
I have a problem with my Mailman 3-setup. The symptom is that postfix rejects non-existing addresses for my list domains with
<adr@example.com>: mail for example.com loops back to myself
What I guess happens happens is that postfix for some reason accepts the mail as it is for a relay domain and finds that it is not deliverable locally as the address does not exist locally and then tries to relay it on to the appropriate MX server, which is itself and then fails and generates a bounce message.
This is a bit annoying as I have set up postfix to only accept valid addresses. I have set the transport_maps, local_recipient_maps and relay_domains to the files generated by MM3. I run an older version of MM3 (3.0) but prefer to fix this without upgrading as upgrading is a relatively big undertaking.
This is mostly a backscatter problem for spam I guess.
Any ideas of very simple and easy to forget things that I've probably missed?
Cheers // David