<a href="mailto:YourMailAddress">Send a mail to me</a>
Replace the red parts with the email address and the text your link should show,
for example:
<a href="mailto:A.Waechter@logics.de">Send a mail to MudGuard</a>

To link to a website:
<a href="http://YourWebAddress">Click here to go to Website</a>

for example:
<a href="http://www.mudcat.org">Click for the best Website</a>