1) Double click the button on the Canvas, this will take you to the
      "Link Properties: Button" dialog box.
2) Select the Get URL Action
3) In the Network URL field, enter the Email address in the form:
    mailto:name@nowhere.com

Do not include any spaces in the mailto link.
Leave the target field blank.

Now, clicking the button in the movie will open the browser's mail composition window, so the user can send a message to you.

Mailto: links work for most browsers and email programs.
However Internet Explorer Browsers must first have a mail program set-up in the Internet Explorer program for Mailto:  links to work. Netscape has a built-in mail program.