Email while on foreign travel

Recently traveled to Canada from USA and found that I could receive Cox email (using Outlook on Win10), but I could not send. How do I prevent that from happening the next time I travel?

I ended up using WebMail, but found I would have to log in to local network, navigate to Cox, log into WebMail.  This is very disruptive when I am working with others who are naturally sending/receiving emails realtime, without all the hassle of navigating to WebMail.

Thx, Eric