I have access to 2.5 million email addresses. They have all purchased a weightless product and are located in the US. The list was built over a 7 year period (most over the last 2 years)so I'm looking for a process/system to "clean" the list and get the users to opt-in on a landing page....so they are "fresh". So I'm looking for a flow diagram with recommended services/hosts. Basically the process to run these email addresses through. Also any copy writing service for the email content would be good. I think a good flow diagram (visual) would be beneficial to the forum... I'm happy to share my results after following the best system.