Amazing list of free solo ad websites. I have never believed in solo-ads. But I will definitely try them and see. As you said copy-writing , landing page, split-testing skills will help us a lot in getting good conversions . Really great tip on creating new email accounts to get free credits. Tracking your clicks and visitors will let you know that if we are getting good conversions.
There are lots of ways to buy an email list, but none of them will actually benefit your campaign. Why? Since the owners of these email addresses didn't explicitly agree to receive content from you, there's no telling how interested they are -- or if they're even a fit for what you have to offer. A bought email list is also in violation of GDPR (we'll talk more about this in just a minute).