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Inbound mail delayed from Exchange 2007 to Messagelabs servers

Created: 10 May 2012 | 1 comment
wharmon1's picture

Mail is randomly being delayed from Exchange 2007 server for several hours.  Initially there were DNS lookup errors in the Exchange SMTP protocol logs.  The Exchange transport was changed to utilize an external DNS server and the errors went away.

Now the sender get a message delayed message after 4 hours and eventually the message gets delivered.  No errors appear in the SMTP send connector logs. 

Mail flows properly to all outside domains.  The only delays are to Messagelabs servers.

This is an urgent issue.  What can I do to resolve this problem?

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Denis Kattithara's picture

Well, I would suggest doing another through examination of the DNS lookup functionality. On the other hand you may want to do a TRACERT and PING -T to the Message labs clustername in order to rule out any potential connectivity issues. Also review the Forwarding configuration in your Exchange SMTP Virtual server.

Denis John Kattithara

Partner Assist Services

Symantec Corporation