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The 50-send rule is wrong: how much volume a marketing test needs before you can trust it

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

Most teams declare a winner too early. They send 100 cold emails, see 3 replies on variant A and 1 on variant B, and ship A. That is not a test. That is a coin landing on its side. Below a certain volume you are not measuring the market — you are measuring randomness. I have watched this eat months…

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  1. 2026-09-16 13:29 · DEV Community — AI
    The 50-send rule is wrong: how much volume a marketing test needs before you can trust it

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