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Exchange 5.5 SP4 error message

By marvinl ·
Has any one had experience with the following error message:

A mail message was not sent due to a protocol error.

550 5.7.1 This system is configured to reject mail from *IPADDRESS* (DNS reverse lookup failed)

I am unable to find any info on this particular message. I am not quite sure which system the error message is referring to, my system or the system I am sending to.

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Exchange 5.5 SP4 error message

by XpertDragon In reply to Exchange 5.5 SP4 error me ...

Have you tried looking at this particular web site:

www.exchangeadmin.com

This site is searchable for many common Exchange errors, especially errors after/during Service Pack updates. Good Luck!

Paul M. Chavez

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Exchange 5.5 SP4 error message

by marvinl In reply to Exchange 5.5 SP4 error me ...

I was unable to find anything on that site that helped to resolve my issue.

Thanks

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Exchange 5.5 SP4 error message

by brasslet In reply to Exchange 5.5 SP4 error me ...

Most likely culprit is your DNS or firewall setup.

From MS KB article Q245787:

This problem may be caused by a Domain Name System (DNS) record that points to the wrong mail host for a certain domain. This incorrect DNS information causes Exchange Server to connect to the wrong mail host when you try to send mail to a
recipient in another domain, which generates the error message in the "Symptoms" section of this article.

This problem may also be caused by the incorrect configuration of an "echo firewall." The echo firewall is an advanced device that verifies every command that is sent to the Exchange Server computer. This type of firewall cannot be a
Network Address Translation (NAT) or packet-filter device. If you incorrectly configure this firewall so that it does not accept mail from a domain that it needs to accept mail from, the error message in the "Symptoms" section of this
article may also be displayed. The mail never resides on the firewall, but
passes through it.

RESOLUTION
==========

Use the NSLookup utility to make sure that the MX and A records of the Exchange Server domain on the Internet are correct.

If the problem is related to the incorrect configuration of an echo firewall, then correct the configuration of the firewall.

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Exchange 5.5 SP4 error message

by Shanghai Sam In reply to Exchange 5.5 SP4 error me ...

Poster rated this answer

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Exchange 5.5 SP4 error message

by marvinl In reply to Exchange 5.5 SP4 error me ...

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