To modify the user profile view, edit the /confluence/decorators/profile.vmd file. This template renders the content of that page.
However, this page calls macros defined in other files. For example, the actual macro used to render the username is in /template/includes/menu-macros.vm. This is where you'll have to add logic to render the user's email address as a link and not as straight text.
Looking at it, you'll have to do some additional digging to create a link, but this is where I would start.
FWIW, if the email addresses are "hidden", then you won't be able to render the email address for the user. This is a setting in the Admin under Security Configuration > User email visibility.
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