What is double opt-in and should I use it?

Double opt-in adds a confirmation step: someone signs up, gets an email, and must click to confirm before joining your list. Single opt-in adds them immediately.

Free · no signup · last reviewed August 29, 2026

Double opt-in adds a confirmation step: someone signs up, gets an email, and must click to confirm before joining your list. Single opt-in adds them immediately.

The trade is size versus quality: double opt-in loses the fraction who never confirm, but everyone remaining is verified-real and demonstrably willing. Better deliverability, cleaner engagement, and stronger consent records (required in some jurisdictions, standard practice elsewhere).

Our default: double opt-in for anything public-facing (forms bots can find), single acceptable for closed contexts like customers you already serve. Bot-stuffed lists poison sender reputation fast enough to make the choice for you.

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Everything here is free to use yourself. That’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.

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