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How to troubleshoot NDRs with 5.7.1 and 5.7.3 error codesCases: 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 didn’t match. Their network mask was 255.0.0.0 while the mask of relay settings was 255.255.255.0. Situation 2: Another client receive the same error after upgraded from Exchange 2000 to 2003. Problem: the relay settings didn’t give the subnet. Note: you should restart SMTP after making any relay settings change. Post your questions, comments, feedbacks and suggestions Related Topics Symptoms
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