Tip: Using a double opt-in? Get more confirmations by adding "Important" to the subject line.

The problem with double opt-ins is that subscribers often forget to confirm their emails. Miss fewer opportunities by adding one simple word to your subject lines.

@andreboso of Zero to Marketing uses a double opt-in for his newsletter, meaning that new subscribers must verify their subscriptions. It's arguably the best way to go, but it can result in lost subscriptions. To minimize this, Andrea added the word "Important" to the subject line of his confirmation email. This very simple change increased his growth rate by 30%.

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