mailto:someone@domain
For example, to author a link on your Web page so a person viewing the Web page can send you an e-mail message, you could insert the following text to make my mail a link, replacing someone with your e-mail name and domain with your domain name. The domain name is made up of the name of the organization that maintains the site (microsoft, for example) and a suffix which identifies the kind of organization it is (.com).
Send me e-mail at <A href="mailto:john@microsoft.com">my mail</A>