A signature consists of a few lines of text that can be added to the end of your e-mail messages. You can write anything you want in your signature, and signatures vary greatly from person to person. Some things that are often included in a signature are the sender's full name, the organization they represent, their home page address, and a short quote.

It is considered good netiquette to include a signature with all your e-mail messages and newsgroups postings, and to keep your signature no more than five lines long.

How to add a signature to your e-mail

1. Create a signature in your word processing program, and save it as a plain text file. It should be no longer that four lines.
2. Click the Edit menu, then click Preferences.
3. Click the plus sign next to Mail & Groups. With Macintosh, click the next to Mail & Groups so that it is pointing down.
4. Click Identity.
5. Beside Signature File, type the full path of the file, or click Choose and browse to the file on your hard drive and double-click it. With Macintosh, make sure that File is selected under Signature File, then click Browse and browse to the file on your hard drive and double-click it.
6. Click OK.
7. Your signature will appear at the bottom of every message you send, below two dashes (--).