Copywriting
Subject Lines & Open Rates
Subject Lines: The Attention War
Email open rates are compromised by Apple Mail Privacy Protection, but subject lines still determine whether an email gets opened.
Critical Shift: MPP & Open Rates
Since iOS 15, Apple Mail Privacy Protection pre-fetches and auto-opens a large share of emails delivered to Apple Mail users, inflating reported open rates. A/B testing subject lines using Open Rate is now statistically invalid.New Standard: Test subject lines by Click-Through Rate (CTR) or Reply Rate.
| Technique | Impact | Example |
|---|---|---|
| Numbers/Specificity | +2.5% opens, +7.4% replies | "3 ways to improve your email" |
| Questions | Higher curiosity trigger | "Is your email list costing you money?" |
| Action verbs | Signals agency and benefit | "Unlock your first sale today" |
| Urgency (genuine) | Time-bounded motivation | "Last 24 hours: 30% off ends tonight" |
| Curiosity gaps | Incomplete prompts wanting to know more | "The #1 mistake we all make with email..." |
| First-name personalization | +26% opens | "John, your exclusive offer inside" |
Format & Conversion
Preview Text: The Underused Opportunity
35-140 characters appearing below the subject line. Most marketers leave this real estate empty or rely on whatever the email client auto-extracts from the body.
| Client | Characters Visible | Notes |
|---|---|---|
| Mobile | 35-50 | First line is read by 99% of recipients |
| Desktop | 100-140 | Second line read by ~25% |
| Auto-pull | N/A | Gmail/Outlook extract body if not set explicitly |
The Auto-Pull Problem
When preview text is not explicitly set, email clients auto-extract body text, often rendering "View Online | Click here | Hi [Name]," which adds no value and looks amateur.
- Never repeat the subject line
- Complement the subject and answer "What is in this for me?"
- Write first 50 chars for mobile, then optimize remaining for desktop
Subject: "Your 10% Off Ends Soon!"
Preview: "Complete your purchase within 2 hours for the discount"
Plain Text vs HTML: The Performance Paradox
The results are counterintuitive to most marketers' assumptions. Plain text often wins.
| Metric | Plain Text | HTML | Source |
|---|---|---|---|
| Conversions from existing customers | Higher share | Lower share | Per Litmus A/B tests (magnitude varies) |
| Open rate with GIF vs plain | Baseline | Often lower | HubSpot A/B tests (GIF ~37% lower) |
| Open rate with image vs plain | Baseline | Often lower | HubSpot A/B tests (image ~25% lower) |
| Deliverability | Higher | Lower (more spam filter scrutiny) | Multiple |
Call-to-Action Optimization
CTAs are email marketing's conversion lever. A single prominent CTA typically outperforms multiple competing CTAs by reducing choice paralysis.
| Position | Usage | Performance |
|---|---|---|
| Top third (above fold) | 38% | Highest CTR with sufficient context |
| Bottom third | 35% | Works on short emails, fails on long |
| Middle | 27% | Least common but can work with proper flow |
Do
- One primary CTA (80% of emails)
- Above the fold for promotional
- After sufficient value build-up
- 44x44px minimum for mobile tap
Do Not
- Use "Click Here" (generic)
- Crowd multiple CTAs together
- Ask readers to act before context
- Use sharp corners (dated look)
Design Tips
- Rounded corners (more clickable)
- Sufficient white space around
- Contrasting color
- Personalized copy (+202% CTR)
Storytelling & Emotional Architecture
Storytelling and Emotional Architecture
Stories trigger emotional response, which drives memory formation and action better than feature lists. Research shows stories activate similar brain regions as physical experiences (Speer et al., 2009).
Reading "I was stuck, I tried X, I succeeded" triggers more brain activation than "Our product solves X problem." Stories create transportation. Readers temporarily live the narrative.
Origin/Connection Story
Share your personal origin story or company mission
Build rapport and trustImpact Story
Before/after of a customer win
Reassure they are not aloneAspirational Story
Customer journey from start to success
Help visualize potential futureFirst-Step Story
The very first action a successful customer took
Overcome paralysisOvercoming-Doubt Story
Customer who almost did not take action but pushed through
Address objectionsCall-to-Action Story
Consequences of action vs. inaction
Create urgencyCopywriting Quick Reference
Subject Line
- 7 words average
- 40 chars mobile
- Front-load key info
- Numbers +2.5% opens
Preview Text
- 35-50 chars mobile
- 100-140 desktop
- Never repeat subject
- Answer "What is in it for me?"
CTA
- One primary CTA
- 44x44px minimum
- Personalized copy +202%
- Rounded corners
Format
- Plain text for cold outreach
- HTML for visual products
- Always include plain fallback
- Test both formats