Non-opted in? Spam spam spam. Maybe some other member will come here and give you a better reply.
If you want to use non opted in list... Try more than half million entry...
What do you mean by spam? Any legit ways to utilize the emails?
I acquired them personally and they're very high quality.
high quality? what that mean?
Depends on the niche . Sell them.
If they're non-opted or random, they worth nothing unless you're going to spend money on list cleaning or you have enough resources to handle the bounce rate. You can find MILLIONS of these emails by simple Google search.
But if they're clean and deliverable, you should identify the niche the users would be interested and email them relevant offers preferably affiliate or CPA offer. Don't forget to create your own lander and capture the active subscribers before redirecting the user to offer.
What niche are these emails?