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by threeseed 2109 days ago
One option and something I am using for my startup is to use Clearbit Risk (https://clearbit.com/risk).

It's an API where you give it the user's email address and they tell you if they think it's real or not. I have it such that if it's not risky I bypass the "verify email" step.

Not sure how long the API will be around and it's pretty slow but for now at least it's free.