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Exchange 2003 SP2 External Email Delivery Taking Hours

Posted on 2013-10-28
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Last Modified: 2014-02-10
Hello Experts,

I have  Exchange 2003 SP2 servers in a Front End and Back End Configuration, The front end server delivers email externally using public DNS for lookups. The server is also an OWA endpoint and is published behind a VSAT link with 650ms latency and 1MB bandwidth.

Lately i notice that emails, especially to gmail.com, yahoo.com and my key partner domains take rather long to deliver (over 3 hours in some cases).  This occurs usually in the late afternoons and has done so within the last 4 days.

My latency on the vsat link is around 700ms during such times. I am able to resolve external domains on the front end and am also able to open telnet sessions on port 25.
Incoming emails are however fast (within 60 secs) while this is occurring.

Any thoughts on what else to look at as a culprit in such a situation will be helpful.
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Question by:it_gsr
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Expert Comment

by:Gareth Gudger
ID: 39673489
Could still be a DNS issue. Have you tried changing the DNS servers your mail server uses, just to see if your queues clear out after several minutes?
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Accepted Solution

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it_gsr earned 0 total points
ID: 39838373
It turned out that the VSAT router's serial interface was generating a lot of errors that was affecting traffic. The ISP changed the transmit frequency of the VSAT terminal and that solved the problem.
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Author Closing Comment

by:it_gsr
ID: 39846862
The solution was with the network connections' physical layer. It was resolved after I contacted the VSAT service provider.
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