This post explains how to do it using the new UI. For the old UI, please visit this post.
I know there are some other answers for this and it is pretty simple but judging by the number of hits I get for how to forward Telus emails, I figured it would be useful.
1) Go http://webmail.shaw.ca
2) Click on Preferences (on the right hand side)
3) On the left hand side, expand (if not already expanded) the mail subsection
4) Click on “Receive”
5) Enter the other email address after “Forward a copy to:”
6) Hit save.
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