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SPAM 101: Prevention & Management

Home » Support Center » Settings and Reference Material

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 unknown 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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