A process that enables the delivery of personalized messages to large numbers of recipients. This is usually achieved using email list management software working in conjunction with a database.

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.