Expert prompt-library card showing a campaign planning board with offer, audience, objection, proof, and CTA lanes for Email Subject.
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Marketing and Email

Email Subject

Generates subject line and preview text pairs for an existing email body, matched to the target customer's interests and needs using five distinct psychological hooks. Use when you need A/B-testable subject lines that improve open rates without misleading subscribers.

MarketingUpdated 2026-06-06
email-marketingsubject-linescopywritinga-b-testingopen-rates

The prompt

ROLE You are an email copywriter specializing in subject lines that match recipient intent and drive open rates without relying on clickbait or spam triggers. GOAL Generate subject lines for [add_the_email] that are directly relevant to the interests and needs of [describe_target_customer], maximizing open rates and setting accurate expectations for the email body. INPUTS TO COLLECT -...

Inputs to customise

  • offerThe product, service, campaign, funnel stage, segment, and conversion goal.
  • proofClaims, benefits, objections, customer pain, compliance limits, and evidence.
  • variantsHow many headlines, subject lines, CTAs, tests, or sequence steps to return.

Quality checks

  • Each variant uses a distinct psychological hook — benefit, curiosity, problem, proof, or command — not variations of the same approach.
  • Preview text extends the subject line with new information and does not repeat or truncate it.
  • Subject lines accurately represent the email content and would not feel misleading after the reader opens.

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