Wow, swift work to head off this abuse. Sorry you found yourself in the firing line of scammers like this.
As a suggestion, Twilio SendGrid has an email validation API which will return whether an email address is disposable, along with a bunch of other data and a confidence score for the address as a whole. That might be of use to you.
I wasn't aware of SendGrid's email validation. We use SendGrid already for all transactional emails, will use this add on too. Thanks
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