Why on earth you would stick your email in sig like that? don't you know the way spammers work?
Use these tools to make image of your email address, and keep in sig, if you must.
http://services.nexodyne.com/email/index_custom.php
http://safemail.justlikeed.net/
Otherwise, best way, IMO, is setting up a contact form and linking to it from your signature. I get only 1 spam mail per week to my email address in sig.