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Re:Ask HN: Would you see value in a “verify email” API? by jjoe on Thursday January 05, 2017 @08:59PM (#13333307)
It could be useful but the entity behind this service would need to be reputable with a proven track record. Because what this amounts to--from an end user perspective--is a breach of privacy.

As for the technical part, I think you're better off passing a callback URL to the service so it posts to it when the user verifies the email. The callback URL could be an AWS lambda.

Re:Ask HN: Would you see value in a “verify email” API? by alexchardin on Thursday January 05, 2017 @09:18PM (#13333397)
Understood on the privacy concerns. Good point.

Agreed that the Callback URL is definitely preferable, if the consuming application has a backend (Lambda or more substantial). Thanks!