So it seems that my problem is that my mailman server attempts to communicate with mailhost through mailhost's outward facing IP rather than through its internal network IP, I have added an entry for mailhost in the hosts file but sendmail still insists on communicating with mailhost through mailhost's external IP. I am not sure how to change this behaviour.
Abdullah > From: [email protected] > To: [email protected]; [email protected] > CC: [email protected] > Date: Mon, 28 Jul 2014 13:47:40 +1000 > Subject: RE: [Mailman-Users] emails from mailman rejected with error > "reject=550 Relaying denied. IP name possibly forged" > > > Stephen J. Turnbull wrote: > > It occurs to me that the DNS problem may be that your HELO > > hostname (in the SMTP transaction) doesn't match the reverse > > lookup for the IP observed in the TCP connection. That > > should be easy to fix in the Sendmail configuration. > > That sounds like something similar to what happened to us when someone > decided they'd reconfigure our mail server to send from a different ip > address than we receive mail on. > > We got away with it for a long time, but as more recipients installed spam > filters (this was a few years ago), we began to see more bounces when we sent > mail. Fixed by setting up reverse lookup for the sending address. > > Peter Shute ------------------------------------------------------ Mailman-Users mailing list [email protected] https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
