Microsoft exchange Greylisting reject

I am sending from Outlook Web Access
Get this error from receiving postfix server

 < #4.0.0 smtp;450 <>: Recipient
address rejected: Greylisted, see>
Reporting-MTA: dns;

Does not exchange2003 support greylisting?
What do i have to do?

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Dave StringfellowIT managerCommented:
Exchange does support greylisting by default. I cant think of how you could change it so you would fail, as Exchange will autmaticly try to send the mail again.
You don't need to do anything, that's a message caused by greylisting working correctly.

The 450 error is a temporary error (4xx is a temporary error, 5xx is a permanent error), therefore the sending mail server should retry again shortly.

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