I manually added the line:
MYNETWORKS = ['up.stream.server.ip']
to the /opt/iredapd/settings.py file and still had a bounce last night.
I don't really like the idea of setting
ALLOW_FORGED_SENDERS
because I don't want anyone just randomly able to forge a sender now and be able to deliver bad mail to my server... sounds like a recipe for disaster. Is there no other fix?