You can create an email signature.
An email signature is often added to the end of an email message. While the signature almost always includes the name of the sender, email signatures also can include information such as mailing addresses, website addresses, telephone numbers and cell phone numbers. The signature also may include a simple word or phrase such as "Thank you," "Respectfully" or "Sincerely." The process you follow to create an email signature depends on which email server you use.
Instructions
Yahoo! Mail
1. Log in to your Yahoo! Mail account.
2. Click "Options" and select "More Options."
3. Select "Compose" from the list on the left side of the screen.
4. Select "Show a signature on all outgoing messages" next to the "Signature header."
5. Click either "Plain Text" or "Rich Text" just above the message box.
6. Type the signature you want to include in your email in the text area and select "Save Changes." You now have created a signature in Yahoo! Mail.
Hotmail
7. Log in to your Hotmail account.
8. Click the "Options" menu.
9. Click the "Personal e-mail signature" link under "Customize Your Mail."
10. Select "Rich text" or "Plain text" from the drop-down menu just above the message pane.
11. Type the email signature into the message box and click "Save." You now have created a signature in Hotmail.
Gmail
12. Log in to your Gmail account.
13. Click the "Settings" link at the top right of the page.
14. Type your signature into the box next to "Signature."
15. Click "Save Changes." You now have created a signature in Gmail.
