I recently used a website to send out 600,000 emails promoting my affiliate link. It has only been running for a day now. However, they use a tracking program so I can track how many emails have been sent, how many people have opened the email, and how many people have clicked on the link in the email. So far I have had 1800 people open the email with 170 clicks. All of these visitors are targeted traffic. This has also been a direct result of 3 sales. Only 40,000 of the 600,000 emails were sent out so far and only 1800 opened. I have over doubled my investment. I am very pleased with email marketing. I just wanted to share my experience with everyone on here, I will keep everyone updated on how the rest of the campaign goes! =]. Good Luck!