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How to troubleshoot NDRs with 5.7.1 and 5.7.3 error codes


Situation 1: one of our clients received NDRs with 5.7.1 and they use Exchange 2003.

Problem: After checked the relay settings, we found the subnet mask didnít match. Their network mask was while the mask of relay settings was

Situation 2: Another client receive the same error after upgraded from Exchange 2000 to 2003.

Problem: the relay settings didnít give the subnet.

Note: you should restart SMTP after making any relay settings change.

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