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How to troubleshoot NDRs with 5.7.1 and 5.7.3 error codes
Symptoms: 1. when sending a mail to blin@mvps.org, you may receive undeliverable message like this:
<mail.chicagotech.net> #5.7.1 smtp; 550 5.7.1 <blin@mvps.org>... Relaying denied. IP name lookup failed (x.x.x.x).
2. Non-delivery reports (NDRs) that
contain 5.7.1 or 5.7.3 error codes are associated with Application event log
event IDs 1709 and 1710: Event Type: Warning Post your questions, comments, feedbacks and suggestions Related Topics Possible Causes Resolutions
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