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Seems like that address is already in use on the domain somewhere.<br />
<br />
Issue the following command in Exchange Management Shell to verify where the account is:<br />
<br />
Get-Mailbox -identity * | Where {$_.Name -like &quot;Example*&quot;} | Select Name, DistinguishedName
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Hello, <br />
<br />
Thanks Amit, &nbsp;Sure enough, there was a 2nd email address defined on a user with the same name.<br />
<br />
Appreciate the help.<br />
<br />
Matthew
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Great thanks for the points.
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Hello,<br />
<br />
I am trying to add a Distribution List. &nbsp;This list was used previously and deleted some time ago. &nbsp;When re-adding the list the email address it assigns to it inserts a &quot;2&quot;. &nbsp;Example. &nbsp; example would be the Dist List. &nbsp; example2@mydomain.com &nbsp;is what ends up being inserted for the associated email address. &nbsp; So, somewhere in the system it remembers the old address. &nbsp;Although I can't see it anywhere.<br />
<br />
Any suggestions would be greatly appreciated.<br />
Thanks<br />
Matthew
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Hello,

I am trying to add a Distribution List.  This list was used previously and deleted some time ago.  When re-adding the list the email address it assigns to it inserts a "2".  Example.   example would be the Dist List.   example2@mydomain.com  is what ends up being inserted for the associated email address.   So, somewhere in the system it remembers the old address.  Although I can't see it anywhere.

Any suggestions would be greatly appreciated.
Thanks
Matthew

Exchange 2013 re-using an old Global Dist List address

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.