Mailrecipe limits the number of emails you send to a user to 1 per day

Hacker News

Last week, I spammed my users with emails by mistake. I had written an idempotent method to do a transaction and send a confirmation email. I didn't realize the email call is not idempotent. So, when the transaction failed, it retried again and again and spammed the entire user base with emails. I was so embarrassed and wrote an API layer on top of my email delivery service (SendGrid) to ensure that my users won't get more than 1 email per day, irrespective of my architecture or mistakes. I am publishing it as a public API, in case anyone else needs it: https://rapidapi.com/mailrecipe/api/mailrecipe Have you run into this problem? How did you solve it?

Visit product View on Hacker NewsFeb 18, 2019

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nativeThis product was originally launched on this platform.

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58%58% predicted probability of success on TrustMRR, based on ML models trained on real launch data.

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2%2% predicted probability of success on BetaList, based on ML models trained on real launch data.

Incorrect prediction on native model

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