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Exchange 2010-Remote Response 554 5.1.0 Sender denied

Last Modified: 2012-05-12
One of my users has stopped receiving payment confirmations from Paypal after we migrated to SBS 2011. It appears that Paypal is using his email address as the sender and that it wants to relay thru our server.

Her is the error supplied by Paypal
Last Updated Recipient Sender Current Status
2011-09-21 13:11:00 jon@rXXh.com "jbXXllo@one8sXXons.com" PermFailed
Subject JoXXhan BXXo sent you $1.00 USD
Failure Reason Mail Block
Remote Response 554 5.1.0 Sender denied

Last Updated Recipient Sender Current Status
2011-09-16 15:06:25 jon@rXXh.com "nim_____doc@gmail.com" PermFailed
Subject J___s M___s sent you $44.00 USD
Failure Reason Mail Block
Remote Response 554 5.1.0 Sender denied

The 554 sender denied is the response from your server. We have no control over this.

You will need to check the server's configuration and see why our messages are being rejected.

So I'm assuming that they are trying to relay thru us?

How do I let him send mail from Paypal to himself?

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