harvested emails

Hello guys! Just have a noob question for ya all! What can i do with a harvested list of emails? Can i even do something with it?.. They're not opt-in. If they where i would make a nice dollar i guess. And what will happen if i send emails to all those anyway? Best Regards!

I buy emails address lists. E-mails must be harvested from HomeAway Tripadvisor and FlipKey members only. I don't need emails scraped from reviews or anything else. To get members emails only websites messaging system must be used inquiries sent and reply is received via email. I need people...

Hey guys, I will provide the domain if someone can let me know if they can obtain email addresses of the users for a small forum. Not too sophisticated of a forum. I could use an agent to send every user an email and have a reply to address to obtain it. Or post threads about something...