What shall i do with all these???

I am running testing some CPA methods on gumtree and i am collecting a large number of emails daily. Any ideas on what i should do with them???

Send them a lead where they need to fill in info. Make sure it requires no cc and it's an easy fill in. I'd look for atleast 2-3 bucks per lead if you can. Make sure to use a double meta refresh unless the advertiser allows email traffic.