weird mail processing of user@domain.com.

we have someone that has contacts with  user@domain.com.  (trailing dot after com)
exchange 2003 delivers them fine.  If he sends it to me, im on the same exchange site but on 2007 server and it bounces if i reply to all.
why would exchange 2007 reject it, but 2003 allows it?
can if fix it for one or both? i just want the same result on both.
LVL 11
EricIT ManagerAsked:
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MichaelVHConnect With a Mentor Commented:
I just realised that probably won't change things either, since you're sending the emails...
Move the user over to Exchange 2007 and you'll get rid of the inconsistent experiences ;-)
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MichaelVHCommented:
In Exchange 2007 this is by default. This has to do with some RFC that defines how email addresses are built up.
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EricIT ManagerAuthor Commented:
Can i trick it to allow it? or even better make exchange 2003 break it so at least the user on the 2003 box gets as annoyed by it as everyone he emails?  Its a upper management type, I am only going to drop so many hints.
lol
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MichaelVHCommented:
I don't think that's possible. The only thing I could think of is changing the Domain Validation for Exchange 2003.

Have a look here:
http://support.microsoft.com/kb/291828
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EricIT ManagerAuthor Commented:
ha.  i should  its still in test mode. only 4 people on it.
Im skipping it and going straight to 2010 i think.
my guess is he has it it stored in his recent addresses *.nk2 file.
im gonig to sneak in, type it, and delete the entry so he has to re-key it.  

Thanks for info.
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