Make a page for yourself with your mail address and phone number. At the bottom of files for which you are responsible, put a small note -- say just your initials -- and link it to that page. The address style (typically right justified) is useful for this.
Your author page is also a convenient place to put and disclaimers, copyright notices, etc which law or convention require. It saves cluttering up the messages themselves with a long signature.
(If you are using the WorldWideWeb.app hypertext editor, then you can put this link from your default blank page so that it turns up on the bottom of each new document automatically)