This is an accepted solution.
The phrase you are looking for is the mailto: function. So in the link field when setting up that footer menu item, you will want to set it to: mailto:firstname.lastname@example.org
Be sure to tweak it to match your email address. When it's clicked on it will open up their email client to send an email to that address.
If there is anything else I can help you with, please let me know.