3/19/2026 • 4 min read
Personalization in subject lines
When personalization lifts open rates and when it starts to feel forced.
Personalization works best when it adds relevance, not novelty.
Useful personalization
- Referencing a role or team
- Mentioning a lifecycle stage
- Calling out a recent action
- Using a first name sparingly when brand trust already exists
Put this advice into practice
Test your next subject line before you send it.
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