You don't necessarily have to read your e-mail at CSLab if you're used to reading your e-mail somewhere else; you can forward your CSLab e-mail elsewhere.
However, CSLab e-mail is a more reliable service than some of the "free" e-mail services and I would suggest you consider the strategy of forwarding your other e-mail to CSLab and reading everything here.
Or you can use any imap client and point it to imap.cs.toronto.edu. Turn on "TLS" or "STARTTLS". Outgoing mail server is smtp.cs.toronto.edu.
Much more at http://support.cs.toronto.edu/email/
There is also a "webmail" facility at https://webmail.cs.toronto.edu/afterlogic/
If instead of creating a ".forward" you create a file called ".forward-nonspam", then a probabilistic spam filter is run on your mail messages and they are forwarded only if it decides that they are not spam; and spam is discarded.
Please test the forwarding after you turn it on! (Note, however, that GMail likes not to show you messages it thinks are from yourself, so send from elsewhere for testing purposes (e.g. from your CSLab account itself).)
This service is called "UTmail+". For some reason, it is outsourced to Microsoft. So, to read your "UTmail+", configure your imap client as follows:
Detailed instructions for configuring Thunderbird are described at
https://uthrprod.service-now.com/infocomm?id=kb_article&sys_id=7b59482ddb699110a350b8f3f39619f4
Detailed instructions for configuring Apple Mail (Macintosh) are described at
https://uthrprod.service-now.com/infocomm?id=kb_article&sys_id=6adacc21dba99110a350b8f3f39619d9&table=kb_knowledge
Or you can read your UTmail+ on the web at https://mail.utoronto.ca .
Or you can forward it to CS or anywhere else by going to the URL https://outlook.office.com/owa/?realm=utoronto.ca&path=/options/forwarding