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How to troubleshoot NDRs with 5.7.1 and 5.7.3 error codesOther possible Resolutions: Incorrect DNS configuration The NDRs and associated events that are described in the "Symptoms" section can occur if the Domain Name System (DNS) feature is not configured correctly. Ensure that MX records point to the correct SMTP virtual server. If DNS is not configured correctly, incoming SMTP connection attempts might randomly connect to the wrong SMTP virtual server. No matching Recipient Policy for proxy addresses The NDRs and associated events that are described in the "Symptoms" section can occur if users have e-mail addresses that were manually entered, but that do not match any of the existing recipient policies. As a general rule, proxy addresses should match at least one recipient policy. The servers require additional authentication NDRs that contain the
5.7.3 error code can occur if anonymous authentication is not permitted by
the receiving server. Ensure that the sending client or sending server can
authenticate to the target server. The NDRs and associated events that are described in the "Symptoms" section can occur when you use Microsoft ISA Server 2000 and the external IP address of the ISA server changes, when the IP address for the SMTP Publishing rule has not been updated to reflect the new external IP on the ISA server, or when the Isactrl service has not been restarted after changing the IP address of the SMTP Publishing rule. Post your questions, comments, feedbacks and suggestions Related Topics Symptoms
Possible Causes Resolutions
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