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Exchange 2007 Your message wasn't delivered because of security policies - Requested #550 5.7.1 Recipient rejected

SBS2007 server.  Trying to add an additional e-mail address for existing user.  I go to user mailbox in Exchange Mtg. Console and then to properties for the user's mailbox under Recipient Configuration/Mailbox.  On the e-mail address tab I add the new address, which is on the same domain.

When anyone tries to send a message to that address, they receive an NDR:
Delivery has failed to these recipients or distribution lists:

cvb@customerdomain.org
Your message wasn't delivered because of security policies.
The following organization rejected your message: Requested.
________________________________________
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: PCSS1.pcs.local
cvb@customerdomain.org
Requested #550 5.7.1 Recipient rejected (R4) ##

In the above example, cvb@customerdomain.org is the new email address I added to a user, user1@customerdomain.org.  The server PCSS1.pcs.local is my internal server at my office that I'm sending the tests from.

I checked Mail Flow Settings for that user, and there are no delivery restrictions.


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pcspcs
Asked:
pcspcs
1 Solution
 
Jeff BeckhamEngineerCommented:
@customerdomain.org is already in use?  Is the "Require that all senders are authenticated" option checked on the mailbox?  Are they using some sort of proxy service or device (perhaps performing anti-virus or anti-spam)?  Are you testing from internal or external mailboxes?
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pcspcsAuthor Commented:
Yep, it was an external proxy for anti-spam that was stopping it.  I needed to add the new address as an alias there too.  Thanks!
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