You can but we wouldn’t recommend it. Email lists with data good enough to be worth having will either be jealously guarded by its owners or cost an amount that will be disproportionate to the returns you might receive. A blind list may breach data protection laws (particularly for private addresses) and result in spam reports from recipients and subsequently your domain name being blacklisted. We prefer to help clients generate their own in-house lists and mine the data they already have to kickstart this process.