"A list broker acts as an agent for
those who wish to conduct direct marketing campaigns via
direct mail, email or telemarketing. List brokers provide
lists that, minimally, contain a prospect's name and contact
information. Additionally, lists may include additional
information such as age, sex, etc. Many promotional
mailings such as catalogs, coupons, promotional offers and
credit offers utilize lists purchased through list brokers." – wikipedia.com.
Email marketing is one of the best ways to promote your website
products and/or services.
Here's
a list with more information about Email List Brokers. Check it out.