The subject line tells the recipient what your email is about. It should be short enough to scan and consistent with the content.
Useful guidelines
- Use plain, relevant language.
- Make the topic clear without exaggerated promises.
- Keep personalization accurate and natural.
- Test alternatives with similar audiences.
Do not use fake "Re:" prefixes, imply a meeting that never happened, or invent urgency. Looking like an internal message is not a reason to mislead the recipient.
Illustrative examples
- "Question about your onboarding"
- "An idea for [company]"
- "Customer support workflow"
Choose an example only when it accurately describes your email. Judge results through useful replies and conversations; tracking pixels can make open-rate comparisons misleading.
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