But just for the sake of letting others know your email without displaying it for spambots to find, here is how you can do it.
The basic function tag is called "mailto". You can just add your email and link text into the following code:
You can also make an image a link to an email. This is most effective if you're using an envelope image and it says 'contact us' (just a suggestion ^^).

And just to add some extra features, you can also preset the email subject title in your email link tag. It's best if you use this for things like affiliation emails where lots of people forget to add a title and you delete it thinking it's spam.