How do I add a subject line to a mailto?
If you want to add a subject to that e-mail add ? subject=<subject> to the mailto tag. For example, the complete tag would look similar to the example below. You can also add body text by adding &body=body to the end of the tag, as shown in the example below.
How do I email a mailto link?
In the message, select the text or picture that you want to display as the link. On the Insert tab, click Link or Hyperlink. Under Link to, click E-mail Address. Either type the email address that you want in the E-mail address box, or select an email address in the Recently used e-mail addresses list.