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Relaying denied. IP name lookup failed

Posted on 2004-08-16
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Last Modified: 2012-06-27
We are getting the following error from our Exchange 5.5 server:

----- The following addresses had permanent fatal errors -----
<jason.lavetan@cooperbooth.com>
    (reason: 550 5.7.1 <jason.lavetan@cooperbooth.com>... Relaying denied.
IP name lookup failed [xxx.xxx.xxx.xxx])

   ----- Transcript of session follows -----
... while talking to cooperbooth.com.:
>>> DATA
<<< 550 5.7.1 <jason.lavetan@cooperbooth.com>... Relaying denied. IP name
lookup failed [xxx.xxx.xxx.xxx] 550 5.1.1 <jason.lavetan@cooperbooth.com>...
User unknown
<<< 503 5.0.0 Need RCPT (recipient)

It just started happening over the weekend.  We can send internal email fine, and outgoing mail is working fine, just not incoming.  It seemed to have happened after we did our end of month server reboots this past Friday.

Anyone have any ideas?  
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Question by:jlavetan
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by:ikm7176
ID: 11810821
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Author Comment

by:jlavetan
ID: 11813034
Actually I answered this myself....

It was a screwed up MX record... I already knew about what the article describes.  Our server is setup not to relay.

We simply had to fix the MX record.  Problem Solved :-)
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