SmoothOperator and Zoso, just so you know, a lot of us do not recommend using the carrier supplied email address, xxx.blackberry.net address. But if it works for you, that is fine, but be aware of what could be potential problems.
Here is why:
The only way to read mail to that address is on the BB itself.
It has no SPAM filtering so if the address gets "harvested" you will get more spam than you wish.
And, you cannot take that address with you if/when you change carriers.