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??
modmacAsked:
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matheweisCommented:
Make sure he is sending using the correct account and that the "From" address is correct in the 3rd profile.
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matheweisCommented:
(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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