Author:Brendon Upson
Email:bupson at wnc.net.au
Subject:RE: SMTP: Relay vs Direct
Category:Administration
Message:

A quick Google (lol) revealed a lot of 451 smtp errors. "Protocol violation" is a worry - no more info on exactly what the "violation" was?

 http://www.faqs.org/rfcs/rfc2821.html says 451 is a "Requested action aborted: error in processing", equally as vague.

Check your server has a public reverse dns lookup too - some sites abort if you do not have one due to potential spam.


Threads:
SMTP transfer   Chris Bekas 17.Nov.05
    SMTP: Relay vs Direct   Brendon Upson 17.Nov.05
        RE: SMTP: Relay vs Direct   Chris Bekas 17.Nov.05
            RE: SMTP: Relay vs Direct   Brendon Upson 18.Nov.05
        RE: SMTP: Relay vs Direct   Chris Bekas 23.Nov.05
            RE: SMTP: Relay vs Direct   Brendon Upson 23.Nov.05