the most simplest way would be to add a mailto link
<a href="mailto:email@address.com">
but that was is possible to lead to spam coming into your mailbox, another way it to just make it a picture so they have to go into their own email client and type the address into the To: box, you can also make it text, email @ address.com, and not connect the @sign so most spiders will not pick it up.
you can also find a script on the internet that sends the email to your from a form on your website, and use a CAPTCHA to prevent bots and spam