Two recipients are configured with the same e-mail address

After changing/modifying a couple of user accounts in AD, we are getting this error message when attempting to email one of the recipients that was involved with the change?  We are on Exchange 2003.  I have double and triple checked these accounts and everything looks in order.  I am suspicious of the address book and caching.  Has anyone seen this before and have ideas?

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Nadav SolomonCommented:
Check out this article: Finding Duplicate SMTP Addresses
cheesebugahAuthor Commented:
I think it is our GAL that is jacked up here?  The changes I made in AD are not reflected in the GAL.
cheesebugahAuthor Commented:
Does anyone know if I can "rebuild" the GAL during working hours or if this is something that should be done during off hours?  Also, do you think this is my problem?  It sure looks like it to me as the changes I made in AD are not reflected in the GAL at this time.
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Nadav SolomonCommented:
when you check the GAL you should do that using OWA or outlook in online (not cached mode).
did you search for the duplicate email address?
I dont see any reason not do rebuild GAL any time you want to it should not effect users especially those that work in cached mode (which should be all your users).
You can use the Update-GlobalAddressList in Exchange powershell.
cheesebugahAuthor Commented:
I did do a search in AD and everything looks great.
cheesebugahAuthor Commented:
I am fairly new to Exchange (Lotus Notes for 12 years).  Is this something typical in Exchange, to have to "rebuild" the GAL every time you make changes?
Nadav SolomonCommented:
not at all and i don't think this is your problem, the duplicate address can come from contact, distribution group or another user, if active directory or exchange say that you have duplicate email address then you probably have one.
If you have more then one domain you should look in your global catalog not only search your domain but the entire forest.

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cheesebugahAuthor Commented:
Well, I can see that the GAL is not updated with the correct contact information.
cheesebugahAuthor Commented:
The GAL just updated?  An odd time to replicate in my opinion.
Nadav SolomonCommented:
so is everything ok now? or you still have duplicate email?
cheesebugahAuthor Commented:
Well, I sent an email to the recipient that got the error message yesterday and I have not gotten the kick back.  The GAL seems to be in order, so I think we're good.  Thank you for your help.  Is there a way to kick off the GAL replication manually?
Nadav SolomonCommented:
Gal is replicating as part of Active Directory replication.. just replicate AD' repadmin /syncall or use dssite.msc.
glad to hear it worked out for you :D
cheesebugahAuthor Commented:
After digging around in AD, I was able to find the duplicate address.  I found it under the Email Addresses tab for SMTP on one of the users that I had modified.  

Thank You
Nadav SolomonCommented:
Glad i could help, thanks for the feedback.
cheesebugahAuthor Commented:
No worries.  You were right, there was a duplication.  I just had to find it.
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