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Sending email to a single domain generates a #554 5.4.4 SMTPSEND.DNS.MxLoopback bounceback

Posted on 2016-09-22
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Last Modified: 2016-10-12
This issue just crept up in trying to send to an internet/external domain. Using an Exchange 2007 server this suddenly appeared with only sending to one specific domain. Receiving mail is no issue and sending to other domains does not generate this issue. Only one domain is causing this issue: #554 5.4.4 SMTPSEND.DNS.MxLoopback; DNS records for this domain are configured in a loop ##.

Is this an issue on my end, since I have had this server in place for many years and never had this problem, or is it on the recipient side?
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Question by:bturnerpcg
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Dr. Klahn earned 500 total points (awarded by participants)
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This is an issue on the recipient side.  Only the receiving domain's administrator has control over their MX records.  

Since this problem eliminates the possibility of sending them email to tell them about the problem, there's not very much that can be done about it at your end.
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by:Dr. Klahn
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EE email requested stale question close.
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