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To warm your email list, start with a send to 50 subscribers, then a send to the next 150. From there, size each new segment by adding the two before it together: 200 (50 + 150), then 350 (150 + 200), then 550 (200 + 350), and so on, spaced 48 to 72 hours apart.
Cleaning your email list can feel like taking a loss. You worked hard for every subscriber, and setting some aside can feel like undoing that work. But emailing fewer people, when they’re the right people, usually grows your reach instead of shrinking it.
The short answer: keep subject lines under 12 words and under 90 characters, since longer ones see meaningfully lower open rates. Numbers in a subject line tend to lower open rates. A dollar sign helps, but skipping the number altogether performs best.
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