I am trying to set up mailman on a VM and have it up and running. However, when it tries to send mail it is deferred with a 450 message:
450 service permits 2 unverifyable sending IPs - <mail host FQDN> is not nnn.nnn.nnn.nnn (in reply to MAIL FROM command)) I am assuming this is because the mailing hostname resolves to an IP but the reverse lookup on that IP is the relay hostname instead. I know that somewhere in either mailman or Postfix this can be fixed but I cannot find anything on how to do that (probably because I don't know what key words to search for). Can someone point me in the right direction. Thanks.
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