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SMTP rejections on

Question asked by asham on Nov 20, 2013
Latest reply on Nov 21, 2013 by shaw-matt

Hi, I'm having some intermittent bounces to valid (outbound) recepients - MTA logs say "550 5.7.1 ... This message does not comply with required standards. (in reply to end of DATA command


This error occurs with several specific recipients. I'm unclear on what distinguishing characteristics these particular recipients have which would cause mail to bounce. Any ideas?