An e-mail link opens a new blank message window (using the mail program associated with the user’s browser) when clicked. In the e-mail message window, the To field is automatically updated with the address specified in the e-mail link.

To create an e-mail link using the Insert E-Mail Link command:

1. In the Document window’s Design view, position the insertion point where you want the e-mail link to appear, or select the text or image you want to appear as the e-mail link.

2. Do one of the following to insert the link:

• Choose Insert > E-Mail Link.
• Select the Common tab in the Insert bar, and then click the Insert E-Mail Link button.

The E-Mail Link dialog box appears.

3. In the Text field, type the text to appear in the document as an email link.

4. In the Email field, type the email address that the mail should be addressed to.

5. Click OK.

To create an e-mail link using the Property inspector:

Select text or an image in the Document window’s Design view.
In the Link text box of the Property inspector, type mailto: followed by an e-mail address.
Do not type any spaces between the colon and the e-mail address. For example, type mailto:jdoe@macromedia2.com.

Source: Dreamweaver MX Help