- what email verifier is the best service

[user] You're totally right with this. Current verification tools (Findymail included) only verify the deliverability (ie. the inbox exists) but not necessarily that the person is the one you wanted to reach initially. That's because currently email verification tools don't get the input data/request (ie. the person you wanted), just the email. This leads to exactly the issue you mentioned, I've talked about it here: linkedin.com