Domain name in Exchange 2003 SMTP email address modification

All of my users have the email address appearing as username@ABCdefg.com and I would like them to appear as username@abcdefg.com (basically lowercase).  I am using Exchange Server 2003 Std. in an all Windows 2003 forest.  I tried changing the RUP defautl policy so that "ABCdefg" domain name would appear as "abcdefg" but even when I go to make a new user the defauly email address is going to @ABCdefg.com and then I have to later change it under the users SMTP address setting.  The main purpose for my request is because I am using Exclaimer to produce corp. signatures and I do not want the email address to appear in uppercase.
draracleAsked:
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SembeeCommented:
Unfortunately Exchange sees ABCdef and abcdef as the same thing.
You will also see problems with the email address generation, if you are using the %g.%l@domain.com for example then you will get the John.Smith@domain.com. I usually end up resetting the email addresses manually.

Simon.
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draracleAuthor Commented:
I'm guessing it's doing it this way because of the domain name being spelled ABCdefg.  I wasn't sure if there were settings that could be modified to correct the problem at hand.
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draracleAuthor Commented:
Chaging the way the domain name appeared in the default recipient policy corrected the problem where new users would get stuck with username@ABCdefg.com.  Even though during the new user creation process it shows username@ABCdefg.com, AD will report the email address correctly as username@abcedfg.com.  

Regarding ADModify.NET, the mass update change would not do first initial + last name @ domain.com for some reason.  The %1g@s would just show up as 1gs@domain.com.  Oh well, not a big deal I guess, only 50 more people to change manually.
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