User switching and Email

Hello, We are new to xp...I am having an e-mail problem, here it is. There
are 3 of us, with 3 different user names: but we all use the same e-mail
address. When I sign on, get e-mail under my user name, it might be my
wife's email. Then I shut down, go to work, and she signs on under her user
name and is waiting for the e-mail that I have already recieved (she has no
idea I recieved it under my user name).
Is there a way I can foward her e-mail back to her user name? Or Is there a
way we can differentiate e-mails and still use this long time e-mail address?
Thanks for any help and ideas
Tim
.

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