At the bottom of each of my web pages, I have a footer that looks something like this:
Having my email address so easily accessible for so many years (hewgill.com celebrates its 10th anniversary next year) has undoubtedly helped contribute to the incredible volume of spam I get. However, I don't want to reduce the usability and accessibility of my site, and if people would like to click on my email address to email me, they should be able to. Therefore I have refused to obfuscate my email address as it is published on my own web site.
Then, in the HTML source where you want to use a clickable email address, do something like the following:
Having said all that, I still haven't deployed this method on my own web site. But it's live on Amy's web site if you want to see it in action.