Or you can tell them you want to keep that email address and pay $5/month I believe for "email hosting." My Dad is doing this, but they goofed up and his email account got closed some time after he cancelled his services, but they reversed it once he called. And hosting only allows one address, not 9 other optional email addresses or even aliases like full internet customers.
Authorized Service Provider (Contractor) for MTS Allstream. Any views expressed are my own.