Email marketing
Email is the only channel you own, which makes it the most valuable and the easiest to destroy. Sending to people who did not ask, or too often, loses the list permanently and damages deliverability for everything else.
Method
- Send only to explicit opt-ins. Purchased and inferred lists produce complaints that damage sending reputation for all your mail (see email-deliverability).
- Segment by behaviour, not by demographics. What someone did in the product predicts relevance far better than who they are.
- Automate lifecycle sequences. Onboarding, activation, and re-engagement triggered by behaviour outperform broadcasts and run without ongoing effort (see user-activation).
- Write for one action. A single clear next step per email; several competing calls to action reduce all of them.
- Earn the subject line honestly. Misleading subjects raise opens once and train people to ignore or unsubscribe.
- Respect frequency limits and preferences. A global cap and granular preferences keep the list healthy (see unsubscribe-and-preferences).
- Sunset the unengaged. People who have not opened in months hurt deliverability, and removing them improves inbox placement for everyone else.
Boundaries
Consent requirements for commercial email are legal and differ by jurisdiction. Open rates are unreliable because of privacy protections and should not drive decisions alone. Transactional messages have different rules and must stay separate (see transactional-messaging).