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Messages are queued, cannot send to external domain

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Messages are queued, cannot send to external domain - 15.Aug.2011 10:03:31 PM

mk200767

Posts: 2
Joined: 11.Jun.2011
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I am using Exchange Server 2007, I keep getting message "451 Lookup failure (#4.3.0)" message when sending mail to a particular address (domain). and the messages are queued.So far, only one domain having that issue that i am aware of. eMail from that domain can get thru to our mail server but our email to them could not get thru to them most of the time.