Relaying denied

We recently began receiving the following error when replying to certain
emails. This is an Exchange 2003/Outlook 2003 environment, with Outlook
configured as an Exchange Server Account. The only thing I can think of is
that we do have 2 different external IP's emails may go out through but they
both resolve to mail.company.com.



The following recipient(s) could not be reached:



user@xxxxxx on 1/10/2007 3:22 PM

You do not have permission to send to this recipient. For
assistance, contact your system administrator.

<mail.mycompany.com #5.7.1 smtp;550 5.7.1 <user@xxxxxx>...
Relaying denied. Proper authentication required.>

Thanks - Sean


.

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