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How do I write a good subject line?

Be specific, be short, and describe what is actually inside.

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Answer

Be specific, be short, and describe what is actually inside.

Under 50 characters is a good target, because that is roughly what shows on a phone. Front-load the meaningful words — the end often gets cut off.

What tends to work: a specific question, a concrete detail, a plain statement of what is in the email, or the recipient's own situation reflected back.

What tends not to work: hype, all capitals, excessive punctuation, vague curiosity ("You won't believe this…"), and anything that misrepresents the content. Misleading subject lines get opens once and unsubscribes immediately after.

Write the subject line last, after the email exists. It is much easier to describe something you have already written.

Do not neglect the preview text — it is a second subject line, and leaving it as the first line of the body wastes it.

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