But the .sig file is more than a simple business greeting or exchange. It allows you to add a personal touch, or a flair, to the message. A .sig tends not to intrude on the readability of the message, since it is at the bottom of the page. However, it does improve the overall content of the message, hence the utility of the message is augmented. Also, the .sig file is effective because email is used more than any other communication medium on the Internet.
Email has a great reach .
The added text of the .sig hardly has an effect on bandwidth, yet the value it provides is high. Finally, don't forget that the .sig file is a very powerful way to advertise . If you have a company or products to sell, the .sig file can be an invaluable marketing device. One simple post to a newsgroup with a well-created message and signature file can generate a truck load of email. It can also point people to your Web site, unobtrusively.