Library/Outreach & Messaging/Email Rewriting & Optimization/Write Ten Subject Line Options from Email Content
TestedOutreach & MessagingQuick Win (under 10 min)

Write Ten Subject Line Options from Email Content

Generate ten subject line variants from email content — at least five using personalization or curiosity.

About this prompt

This prompt generates ten subject line options for an existing email — covering length variants, ROI framing, curiosity hooks, and personalization angles — at 40 characters or fewer. Use it when you need a full subject line test set rather than iterating one line at a time.Subject line testing requires volume to reach statistical significance — testing two variants teaches you less than testing five. This prompt generates ten distinct subject lines for an existing email by covering four different angles: benefit-led lines (what you get), cost-of-inaction lines (what you lose by not acting), personalization lines (specific to their company or role), and curiosity lines (a question or partial statement that compels opening). At least five use personalization or curiosity approaches. Fill in your email content and target persona for subject lines calibrated to what will resonate with your specific ICP. Use the ten as a rotation set across your sequence to gather performance data before picking a long-term winner.

The prompt

You are an email copywriter. Based on the email below, write 10 alternative subject lines that capture the recipient's attention. <email> [PASTE EMAIL] </email> Context: - Recipient name: [RECIPIENT N
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Variables to replace

PASTE EMAIL | RECIPIENT NAME | GOAL, E.G., BOOK A DEMO, GET A REPLY

How to run it

  1. Copy the prompt and paste it into Claude, ChatGPT, Gemini, or Copilot — it's tuned to run in any of them.
  2. Replace the variables — swap each bracketed token for your deal's specifics. The variables list above explains every field.
  3. Make it yours — run it, keep what's strong, and tighten your inputs on the next pass. The prompt improves with your context.

What good output looks like

Make it yours

StageProspecting
SeatAE, SDR, BDR, Inside Sales
DifficultyBasic
Time to valueQuick Win (under 10 min)
Works withAI-Agnostic
CategoryOutreach & Messaging
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