Replies sent to a different domain from which it was created

I have a user running Win XP with Outlook 2003 and is setup with 3 seperate profiles. The first 2 profiles are on the same domain just different pst folders, the 3rd is on a completely different domain and has a seperate pst folder also. The problem is when he creates a new e-mail message from 1 of the 2 first profiles and when someone, no one specific,  replies to the message it goes to his 3rd profile in the other domain??
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Make sure he is sending using the correct account and that the "From" address is correct in the 3rd profile.
(To check which account it is sending from, use the "Accounts" pop-up next to the "Send" button in the composition window)

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modmacAuthor Commented:
The same e-mail sent to multiple people ,all reply and 1 get sent to the 3rd profile while the others are returned properly.
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