SMTP address changes after it is changed in AD

I have a user who has an SMTP address on her account.  Her e-mail address has an extra letter in it.  When I change the address to the correct one, it changes back to the old address within 5 minutes or so.  If I check right after changing it, it looks fine.

Any ideas?
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Go to the properties of the users account.
Change the email address as you need to.
UNCHECK the box that say "Automatically update email addresses based on the recipient policy"

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traffipaxAuthor Commented:
Where can I look at this recipient policy?
In the Exchange System Manager.
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