A very common type of hyperlinking, is to create an e-mail link within a page. This is accomplished by prepending “mailto:” to the desired e-mail address. So, to create a hyperlink that e-mails me:
<a href="mailto:michael.musick@umontana.edu">Email Michael!</a>
Clicking on such a link in a webpage will cause the webpage to try and open the users default e-mail application.
For this reason, it is also good practice to write the full e-mail address out. That way a user can easily copy the address from the browser into the e-mail client of their choice.
Read chapter 4 from the Duckett on Links.