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Re:Ask HN: How to create a single email field like on baseca... by verdverm on Sunday June 23, 2019 @01:41PM (#20257263)
Did you send a confirmation link before granting access. Using an email is one way to do passwordless login, by sending them a link to login.

Maybe consider OAuth?

Re:Ask HN: How to create a single email field like on baseca... by zaphodq on Monday June 24, 2019 @01:20PM (#20265945)
If I send email to spam bots won’t that decrease my domain score?