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How to troubleshoot NDRs with 5.7.1 and 5.7.3 error codes

Possible Causes:

1. DNS lookup failed

2. The sender of the message does not have the privileges required to complete delivery.

3. You are trying to relay your mail through another SMTP server and it does not permit you to relay.

4. The recipient might have mailbox delivery restrictions enabled. 

5. Make sure you mail server is no on a spam list.

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Related Topics

Symptoms

Resolutions

• Enable relay - Authenticated computers not allowed to relay

• Enable Anonymous - Anonymous access to SMTP virtual servers disabled

• Other possible Resolutions

Case Study

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