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A comment on Show HN: Maildown – Markdown email campaigns. Parent comment

Re:Show HN: Maildown – Markdown email campaigns by marcrosoft on Saturday April 06, 2019 @12:42PM (#19591598)
Allowing + is bad. It allows users to churn trials easily.
[ Parent | on HN ]
Re:Show HN: Maildown – Markdown email campaigns by stonogo on Saturday April 06, 2019 @03:54PM (#19592666)
Accept the address and key the user based on the part preceding +.
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Re:Show HN: Maildown – Markdown email campaigns by PerfectElement on Saturday April 06, 2019 @12:49PM (#19591629)
That can be prevented with simple validation on sign up.
[ Parent | on HN ]