troubleshooting Question

trouble sending email to particular domains

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amichaellFlag for United States of America asked on
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Kind of an Exchange novice.  A few days ago one of my users had email to two domains returned to him.  I had another user today with the same issue.  If I track the email through message tracking the last message I see is:

"message transferred to postini through smtp"

Part of the returned email error is:

"Could not deliver the message in the time limit specified. Please retry or contact your administrator.

< #4.4.7>"

We have a third party doing our spam filtering, but they've told us they are doing nothing with outbound mail.  I did a bit of research and learned that Postini is a spam filtering product.  It also looks like error 4.4.7 is an indication of a problem with the receiving server.  Do the above messages/errors mean my users mail is reaching the remote mail server and then being rejected?  

Thank you.
IT Manager

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