Are you sure that was a legit email?
Never mind.. did a bit of searching.. FOUND a legit rogers page on it.. must be something new.. and not necessarily pushed out to everyone yet (None of my family or extended family have got a notice yet)
Did you try and follow the instructions ON the 10.7.3?
I am not a mac user, so cant confirm.. but i would assume, the setup is RELITIVELY the same between the versions.. the instructions should get you into the right section, where you would need to make those changes.
In the mail program:
Mail > Preferences
Choose the account
Outgoing mail server > edit the server settings
change port and enable SSL
Back on the main account details screen, hit advanced
set port and SSL
I agree though, they should have a slightly more updated instructions for the new version, if it varries so much.