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Slow delivery from Exchange 2003 to 2010

I have Exchange 2003 and Exchange 2010 running in co-existance.

Everything works inlcuding bi-directional email flow between the two and OWA.

The difficulty now is that email flow from Exchange 2003 and 2010 is slow. Users are reporting delays of 10-20 minutes. Emails from Exchange 2010 to 2003 is immediate.

Checked the Exchange 2003 Routing Group Connector queue and it routinely has messages whereas the other queues are empty.

Mkris9

What are teh costs set on those routing groups ? if it is high, might need to reduce that.

else have you tried re-creating it ?

5g6tdcv4

Run BPA from the 2010 server and run health check on both servers...post any critical issues.
Thanks

Rajith Enchiparambil

Add more servers as source/target to see whether the 2003 server is the bottleneck.

Check http://www.howexchangeworks.com/2011/09/creating-interop-routing-group.html

mcnuttlaw

ASKER

Deleted and recreated the Routing Group with a cost of 1. No change in delivery times.

The health check shows only two critical issues on the Exchange 2003 box:

3GB is not set
HeapDeCommitFreeBlick Threshold is not set

Rajith Enchiparambil

Do you have a smart host configured on virtual smtp server (2003)?

If so, you need to take it off. Smart hosts should only be configured on smtp connectors.

mcnuttlaw

ASKER

No smart host is on Exchange 2003.

There seems to be almost no delay if the queue on the group connector is just a few. The queue seems to hover above 50 for most of the day which is where the 10-30 minute delay can occur.

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mcnuttlaw

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mcnuttlaw

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Self solution.