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It may have something to do with your mail server settings. It used to be the case where most email accounts would not send emails over the Telus mobile network if you did not use the smtp.telus.net as the outgoing mail server. Try setting it to smtp.telus.net , disable your wifi, and test send a new email to yourself.
I still have hope.
What I really want to do is fill these threads with as much info/probing questions as possible.
To help the OP and possibly others in the future that decide to search for answers. 🙂