It should work. We have 4 different addresses for each user. Check the account details, I use these settings:
Mail server is "POP3"
Incoming and outgoing mail servers are "mail.btopenworld.com"
Account name is the username part of the e-mail address ([email protected])
Password is the one you choose when setting up (i think bt require both letters and numbers)
Hope this helps. Alternatively I think BT will import these settings for you on the webpage.