<A HREF="mailto:">

Activating a MAILTO link brings up the browser's mailing dialog or application associated with Internet mail, making it easy for a visitor to send a mail message to the address that follows the MAILTO attribute.

NCSA Mosaic supports use of the TITLE attribute for a MAILTO link. It allows the author to specify the subject of the mail message that will be sent.

Netscape allows specification of the subject line by using the following syntax:

<A HREF="mailto:someaddress@mail.com?subject=Comments on your Web site">Link text</A>.

Internet Explorer 4.0 and above supports and extends the above possibility, allowing various mail fields to be automatically filled in, by using the syntax:

<A HREF="mailto:someaddress@mail.com?subject=Subscribe to mailing list&cc=otheraddress@mail.com&body=I'd like to subscribe to the mailing list please">Link text</A>

Note that spaces are allowed in the mail fields.