If you are looking for end-users then you cant use a general emailing list?
I have plenty of buyer leads, but only for domain investors. Each domain has a different set of end-users, so I cant see how it would help you to ask for general email lists? Unless you want to spam the world with your names?
If you have some semi decent domain names and would accept investor price level (market value), feel free to send them over to me. If they are any good, I will make you an offer on brokering them.