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Re:Check If Email Exists by tyingq on Thursday July 01, 2021 @09:10PM (#27706858)
Mailcheck is also helpful to catch things like "[email protected]" and other common typos when the user types it in:

https://github.com/mailcheck/mailcheck

Fork modified for React: https://github.com/eligolding/react-mailcheck#readme

Re:Check If Email Exists by justinator on Friday July 02, 2021 @02:52AM (#27708529)
I somewhat lol'd when the demo allowed "[email protected]" just fine. Guess kickstarter isn't using mailcheck anymore. Looks like it's an open issue:

https://github.com/mailcheck/mailcheck/issues/179

Re:Check If Email Exists by tyingq on Friday July 02, 2021 @10:10AM (#27711741)
Oh, yeah, that's not good. Not sure why they didn't just repoint to the suggested https://codepen.io/ianneub/pen/BajKKBy demo.