Sell them as a "Targeted mailing list"...
do you know a marketplace for that ?
I have about 600K emails with specific details like gender, age, profession, and in some part interests. (they are not harvested, nor opt in emails). What's a smart way to use them ? Thanks
Take a random sample of 5k then test that with a SMTP connection or a data validation company to see what the failure rate is. The % of failures in that small sample will closely resemble the failure % of the larger list. After that you'll know if that list is worth your time.
You were smart enough to obtain 600,000 emails yet you can't figure out how to monetize them? That's like building a car and than wondering how to drive it.
Veyron