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Duplicate address error

Posted on 2006-10-27
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Last Modified: 2008-03-17
This has just popped up for one of my users.  Nowhere in AD can I find the duplicate.  But when an outside user sends mail to one of my users they get the error:  "A configuration error in the recipient's e-mail system prevented delivery of this message.  Two recipients are configured with the same e-mail address.  contact your administrator."  I've never seen that before and I didn't think it was possible in AD to have two objects with the same e-mail address.  Anyone have any clues?
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Question by:ewest111
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by:ewest111
ID: 17833471
Yes sorry, I have been staring at this thing all day and got blurry I guess.  It is Exchange 2003 in a AD 2003 environment.
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by:Sembee
ID: 17833595
It isn't easy, but it is possible to get two objects with the same email address. Most often happens when there are more than one domain controllers and something is up with the replication.

I most often see it with email enabled contacts and user accounts.

How did you attempt to find the duplication?

Simon.
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by:ewest111
ID: 17833632
I looked in exchange at the list of mailboxes.  Where should I look?
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Sembee earned 125 total points
ID: 17833711
There are any number of places where the email address could be - not just on mailboxes.
Is the account still triggering the messages?

If so, you could do a dump of email addresses to a file then search for a second copy of that email address in the file.

Install the Windows Support Tools on to the Exchange server, then run the following:

Ldifde -d "DC=domain,DC=co,DC=uk" -r "(&(mailnickname=*))" -l proxyAddresses -f c:\proxies.txt

replacing DC=domain,DC=co,dc=uk with your domain, so if your domain is hq.domain.local then you would run

Ldifde -d "DC=hq,DC=domain,DC=local" -r "(&(mailnickname=*))" -l proxyAddresses -f c:\proxies.txt

Simon.
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by:ewest111
ID: 17852300
I try that command line and i get proxyAddresses is not recognized as an internal or external command.  My domain is umpublishing.org the command I entered was :

Ldifde -d "DC=umpublishing,DC=org" -r "(&(mailnickname=*))" -| proxyAddresses -f c:\proxies.txt

does that look right?
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Expert Comment

by:Sembee
ID: 17853337
Is umpublishing.org your WINDOWS domain? I don't mean your email domain.

Simon.
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by:ewest111
ID: 17861118
Yes it is.
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by:Sembee
ID: 17882850
You have posted the command with a pipe, not an l - it is a lower case L before ProxyAdddresses

Simon.
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Expert Comment

by:TransitionalData
ID: 21362354
I'm seeing this same behavior for one of our users.  It is only one user as far as I can tell and running this command I only see the one user account with the email address.

I've also tested emailing him from a gmail account and the mail went through without a problem.  It only started happening yesterday and we have not made any changes on our mail server.

Does anyone know of a resolutions to this issue?
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by:Sembee
ID: 21362959
TransitionalData - this is an old question. Unlike a forum it is not possible to "bump" questions back up the list. The only people who will see your post are those that have already participated. Instead you should post your question as a new question in the Exchange Server Zone which will allow other experts the chance to see the question and respond.

Simon

Exchange Server Zone Advisor.
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