There is no EWS at wm.shaw.ca, I assume they went with ActiveSync. Aqua uses EWS, not ActiveSync.
The preset uses Internet type mail, not Exchange type mail, and the settings there are consistent with Shaw's support page:
https://community.shaw.ca/docs/DOC-1056Incoming: POP3 (no IMAP), pop.shaw.ca, port 110, no encryption
Outgoing: mail.shaw.ca, port 587, STARTTLS encryption
I just verified that these servers are still there. Don't have an account @shaw.ca, so can't verify authentication.
Note that these incoming server settings don't use encryption. This is per Shaw's help page, above.
Right now it's possible to use SSL encryption + port 995, but I'm not going to change the app's preset -- if it's not officially documented, it can stop working at any time.
And of course there is nothing to prevent anyone from using Manual account setup and entering any settings to his / her liking.