The basic way is as in the answer above
please contact: <A target='_blank' href=
mailto:[email protected]>This text appears on the webpage</A>
But this can be extended to pre-insert the subsect line and even start off the email itself like this:
please contact: <A target='_blank' href=
mailto:[email protected] ?subject=Website%20query&body=Dear%20Joe>This text appears on the webpage</A>
Notice that spaces are replaced by their hexadecimal equivalents (%20). In this example, the email subject will contain 'Website query?' and the email will start off 'Dear Joe'
The section marked 'This text appears on the webpage' is whatever text you want the viewer to see on the webpage.