Exchange 2010 – SMTP address is generated in the format of

When a new user is created, in some cases an SMTP address is generated in the format of instead of although there is no such existing address on the network
Issue is possibly due to the x400 configuration on the e-mail address policy:

When the email address is stamped, x400 finds the 2nd user as duplicated as the user’s First Name and Last Name are same.
So it adds 2 in the X400.

As the X400 found it as duplicate and added 2 , SMTP also follows the same and adds 2 to address.

Solution/Accepted workaround:

Remove x400 configuration from e-mail address policy and restarted the Exchange services.

*Please note that X.400 address function is not necessarily required in pure Exchange 2007/2010 environments.

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