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Do you have a bunch of database names that could use an email, but don't know how to get them?
What would those database names be worth if you could get them? $25? $100? $500?
Have you tried to contact just 100 of them by mail or phone and offer them $10 of free bowling if they give you their email?
What do you have to lose? It's better than having all those names collect dust!
Go to NCOA (mailcleanup.com) and clean your list and then send out 100 letters or postcards or make 100 phone calls (if you have permission). If you get a good response, send out some more.
Keep solving problems.