Changing email setup?

[#1]

I set up 2 other email addresses through plusnet and the option for use same or different password came up so i just clicked on use same password. Now each time im open windows mail in xp i get 3 of the same message come through, one to each inbox.  How can i change it so i get each email to its own inbox?

[#2]

The Windows mail email username should be in this format <account username>+<mailbox name>
Ignore the open and closing <> which are there to make it a bit clearer