You can create a personal signature for your mail messages.
You can add your name, address, e-mail address, or other information. Then, whenever you create a new mail message, your personal signature is automatically appended to the bottom of the mail message. Once added, a personal signature is part of the rich text of the message; you can format it, or delete it.

1). Click on the Preferences button.

2). Click on the Mail button. 3). Check the box to the left of “Append a signature to the bottom of my outgoing mail messages” 4). Enter the text for your signature 5). Click Save & Close