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Robin Vivantleft a comment
I don't get the hype around this. If you read the doc on the github, it says it simply connects to a mail service provider via a way older protocol (telnet) and ask it to send an empty email to the targeted email address. This is simple as fuck to implement yourself and very low resources consuming. That's why this API is proposed free, on a probably low-spec heroku shared instance, which is...

TrumailFree email verification API
