Definition
The peak-end rule, identified by Nobel laureate Daniel Kahneman, says our memory of an experience is not an average of every moment but a summary of the peak (most intense moment) and the end. For email, this means subscribers judge your campaign by the most engaging part and how it finishes.
Application
- Peak moment: Identify and optimise the most engaging element of your email — usually the main offer, story climax, or key insight
- Strong finish: End with a clear, compelling closing — a powerful CTA, memorable line, or emotional note
- Avoid weak endings: Fading out with links to multiple products or a generic "thanks" undermines the experience
Testing
Compare emails that end with a single strong CTA against those that end with multiple secondary links. The single-CTA version often produces better overall campaign recall and higher conversion, consistent with the peak-end rule.
Related Glossary Terms
AIDA Model for Email
The AIDA model (Attention, Interest, Desire, Action) is a classic copywriting framework used to structure email campaigns that guide subscribers from awareness to conversion.
Anchoring Effect in Email Marketing
The anchoring effect is a cognitive bias where the first piece of information presented (the anchor) influences subsequent decisions, used in email to frame pricing and value perception.
Attention Rate
Attention rate is the percentage of email opens that last longer than 5 seconds, distinguishing genuine reads from passive opens, preview-pane views, or Apple MPP auto-loads.
Authority Principle in Email Marketing
The authority principle is a persuasion concept where people trust and follow the guidance of perceived experts, used in email marketing through credentials, certifications, and expert positioning.
BAB Framework for Email
The BAB framework (Before-After-Bridge) is a copywriting structure that paints a picture of the subscriber's current struggle, contrasts it with a better future, and presents your solution as the bridge.
Click-to-Engage Rate
Click-to-engage rate measures clicks per minute of active session, providing a deeper measure of content engagement than standard click-through rate.