Develop subject-line ideas for a re-engagement email using the campaign details below. Audience and inactivity definition: [AUDIENCE AND INACTIVITY] Relationship and prior promise: [RELATIONSHIP AND PRIOR PROMISE] Email’s real content and offer: [EMAIL CONTENT AND OFFER] Brand voice and restrictions: [BRAND VOICE AND RESTRICTIONS]
Send context and test goal: [SEND CONTEXT AND TEST GOAL]
Give me 18 subject lines grouped into three labeled approaches: value reminder, honest reset, and preference or choice. For each line, include a matching preheader of 35 to 75 characters and a brief note identifying the concrete reason the recipient might care. Keep subject lines generally under 50 characters, unless a longer line is clearly justified by the audience or device context.
The lines must accurately represent what the email delivers. Do not imply an expiring offer, account problem, personal message, or prior interaction unless I supplied it. Avoid fake “Re:” or “Fwd:”, excessive punctuation, ALL CAPS, vague curiosity gaps, guilt, and wording that could be interpreted as threatening or shaming. If the goal is preference capture or unsubscribe cleanup, make that choice clear instead of disguising it as content.
Then recommend one A/B test: name the two lines to test, the audience split, the primary metric, and the guardrail metric. Explain why the test isolates one meaningful difference. Before answering, check each line against the actual email content and flag any compliance, deliverability, or brand-risk concern based on my inputs. Ask up to 3 clarifying questions only if a required input is missing.Fill in
| Placeholder | What to enter | Example |
|---|---|---|
| [AUDIENCE AND INACTIVITY] | Describe the recipients, their relationship to you, and how long they have been inactive. | Former weekly product-design newsletter readers with no open or click in 120 days; about 18,000 recipients. |
| [RELATIONSHIP AND PRIOR PROMISE] | State what they signed up for and the value or expectation you previously set. | They subscribed for practical teardown articles and templates for product teams. |
| [EMAIL CONTENT AND OFFER] | Describe exactly what the re-engagement email contains, including any real offer or preference link. | A note asking them to choose one topic preference, stay subscribed, or unsubscribe; it includes a free onboarding checklist. |
| [BRAND VOICE AND RESTRICTIONS] | Describe the approved tone and any prohibited language, legal rules, or brand terms. | Direct and respectful; no false urgency, no guilt, and no claims of personalization. |
| [SEND CONTEXT AND TEST GOAL] | State timing, sender name context, list size, and whether the goal is opens, clicks, preferences, or list hygiene. | Thursday morning from Maya at Field Notes; test open rate while protecting complaint and unsubscribe rates. |
How to use
- Describe the actual email body before asking for subject lines, since the line must make a truthful promise.
- Select a small number of lines that represent different motivations rather than testing near-duplicates.
- Check the selected preheader does not merely repeat the subject line in the inbox preview.
- Follow up with: “Turn the value-reminder approach into 6 lines for [SEGMENT], avoiding the words [WORDS TO AVOID].”
Variations
Win-back discount
Use this when you have a genuine, time-bounded offer for inactive customers.
Generate 15 honest win-back subject lines and preheaders. Audience: [AUDIENCE]. Actual offer, eligibility, and deadline: [OFFER DETAILS]. Email contents: [EMAIL CONTENT]. Brand restrictions: [RESTRICTIONS]. Group lines by savings, product value, and low-pressure return. Every line must accurately reflect eligibility and timing; do not create scarcity I did not provide. Include one A/B test with a conversion metric and unsubscribe or complaint guardrail. Check that no subject line overstates the discount or applies it to excluded customers. Ask up to 3 questions only if needed.
Preference center
Use this to ask inactive subscribers what they still want to receive.
Write 15 subject lines and preheaders for an email inviting subscribers to update preferences. Audience and inactivity rule: [AUDIENCE]. Available preference choices: [PREFERENCE OPTIONS]. Reason for the email: [REASON]. Voice: [VOICE]. Create groups for control, relevance, and respectful cleanup. The subject must make clear that choices affect future emails if that is true. Do not make the preference link sound mandatory or hide an unsubscribe option. Check that every line matches the email’s actual choice architecture. Ask up to 3 questions only if a required input is missing.
B2B nurture restart
Use this when re-engaging business contacts around a useful new resource.
Create 18 re-engagement subject lines with preheaders for dormant B2B leads. Persona and company context: [PERSONA]. Previous content or conversation: [PRIOR CONTEXT]. New asset or reason to reach out: [NEW VALUE]. Sender relationship: [SENDER]. Tone restrictions: [RESTRICTIONS]. Group them into practical insight, relevant update, and direct check-in. Avoid pretending you spoke recently or claiming their company has a problem without evidence. Recommend an A/B test designed for qualified clicks, not opens alone. Ask up to 3 questions only if required.
Tips
- Write the body’s central promise first; a subject line cannot ethically rescue an email with no reason to return.
- Test one message angle at a time, such as useful resource versus preference choice, so a result teaches you something.
- Track complaints and unsubscribes alongside opens; a line that wins attention by misleading people is not a win.
- Segment by prior behavior or original signup intent when possible, because a lapsed buyer and a lapsed content subscriber need different reasons to re-engage.
FAQ
Should a re-engagement subject line say “we miss you”?
Only if it fits your voice and the email genuinely offers a reason to return. It often performs less usefully than a specific value or preference message.
How many subject lines should I test?
Usually two at a time. Testing many lines without enough recipients produces noisy results.
Can I use urgency?
Yes, when the deadline and consequence are real and appear in the email. Do not manufacture scarcity to create opens.