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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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