I am an ebay Powerseller, and also ship my own merchandise. I use both envelope manager (Dazzle) and stamps.com for shipping. It never dawned on me (I am old and slow) that I have a huge database of emails for the last few years of customers.

I may have 100-200,000 (maybe more) emails from sales. I am not sure they are all good.

So here is my question and pardon my ignorance.

How do combine from outlook, netscape, stamps.com and Dazzle into one useable database or list, and then once I have them whats the best way to email them out marketing information without my ISP banning me?

I did not know if there was some harvesting program that could pull them all into a useful list, then some program that would be able to send information back to them, to drive traffic to my non ebay site.

I appreciate any guidance anyone can give