Microsoft software tool used for developing a database. Any database vendor you work with — email broadcaster, list broker, third-party list-hygiene service, etc. — should be able to work with this format (as well as several others.)

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.