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Bounce Back Messages

This section contains common bounce back messages generated by our system.

  • 450 Client host rejected: cannot find your reverse hostname
  • 504 Helo command rejected: need fully-qualified hostname
  • 550 Not Permitted To Relay
  • 554 5.7.1 Sender address rejected: BlueTie SMTP R5: unauthorized use of domain
  • 554 Recipient address rejected: User unkown in virtual alias table
  • Can't create user output file
  • Connection timed out
  • Host not found
  • Malformed name server reply
  • Sender address rejected: not logged in
  • Unknown user
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