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Exchange 2003 Sending through Postini Errors

Exchange 2003 on SBS 2003, I have three different clients using the postini service for thier inbound mail. I will get mail bounced back from my server with the folling message

 There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.mydomain.com #5.5.0 smtp;550 Requested action not taken: mailbox unavailable or not local>
Sometimes they go through somtimes I get this error and a resend once or twice will eventually get the message through.

Any ideas?

1 Solution
The error means what it says - the server the message was delivered to is unable to deliver the message.
What it does NOT mean is that the message was delivered to the correct server. You need to look at your SMTP logs to see what server the message was delivered to at that time and confirm if it is being delivered to another server next time. Almost certainly it is a problem outside of your control, as the remote server is rejecting the message, but convincing someone of the problem is a different matter altogether.

kposkoAuthor Commented:
It is multiple servers so I'll keep watching my logs and then might be able to provide POSTINI with the server or servers giving me a problem...from what ive read here they will not be of much help in resolving this, but we'll see.

Thanks for your help!

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