troubleshooting Question

Greylist problem Exchange 2010

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tigerffsFlag for Afghanistan asked on
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Hello dear Experts.
I would like some assistance in this issue regarding greylist.

We migrated from Exchange 2003 to 2010 recently and with the new server we get stuck in greylist from some specific domains.
According to the owner of the domain, our server sends the email - it gets rejected and then Exchange tries to send it again 4-5 times with an interval of 1 minute.

To get though the greylist, they want me to change the settings for my Exchange server to keep trying for more than 20 minutes and I dont think the "retry interval" of 1 min is default, is it?
From what I have understood, this can be changed in;
C:\Program Files\Microsoft\Exchange Server\V14\Bin\MSExchangeTransport.exe.config

Any suggestions or anyone with a similar problem?
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