You're better off using a paid service like ZeroBounce or EmailListVerify. Most of the “free” or discontinued tools are either outdated, contain malware, or provide poor quality results.
Most of the nulled versions have backdoors, so always install them on RDP, either Windows or Mac. Use Atomic Verifier, which is free for 7 days. The license is close to $69$ for a lifetime on 1 PC, which is pretty much an acceptable range if your cleaning list is huge.
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