A short text file that email users can automatically append at the end of each message they send. Commonly, signature files list the user’s name, phone number, company, company URL, etc.

3 Quick And Easy Ways To Build A Profitable Opt-In List
You finally realize that you need a good opt-in list. After reading countless articles and sought expert advices and have read many success stories of people creating a small fortune with opt-in lists you finally decide to have one of your own.