Does anyone know how to fix this problem -"Postini #550 #5.1.0 Address rejected"

I have one email address at a domain that gets this error on rejection.  We can email others at the domain just not this user.

Any ideas>
Rob HayesDirector of ITAsked:
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Sudeep SharmaTechnical DesignerCommented:
In Postini, ever user can maintain their own Whitelist and Blacklist of email addresses and domains. Probably that user by mistake or by purpose has entered you domain name or the email address from where you are sending the email in his Blacklist.

Sudeep
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Rob HayesDirector of ITAuthor Commented:
This was very helpful- sorry for the slow response
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