While I was in Houston and later in Mexico I was able to receive Telus email but I could not send. I double checked my settings and was using SMTP port 1025. I was using an iPad with IOS 10.2.1. I was able to send using Gmail and iCloud.
Solved! Go to Solution.
My current setup, which works in the USA, matches that provided by @Mobility_Princess except SSL is off.
If I have trouble with it, I usually just choose gmail as my outgoing server from within the mail app.