Note that there are 2 ways to get email on your BB. One is to have it forwarded to your BB email address from any 3rd party email account that will do forwarding. The other is to have it "pushed" from an email account, meaning that your BB service goes out to the 3rd party account and steals a copy of the email off the server, leaving the original on the server.
The forwarding method means that you get incoming email instantly.
The pushed method checks for email on the 3rd party server every 15 minutes. Then if it finds any, it checks again every minute for 2 or 3 minutes (I forget).
You can also set up different notifier sounds and filters for each type. I have important emails (boss, secretary, Wifey, kids' teachers) forwarded so I get them instantly, and have an "important" notifier sound associated with them. All others are pushed, and get an "unimportant" sound.
Its easier than it sounds. :thumbup: