Amey-Thakur Email deliverability
Sending email is easy and arriving is not. Deliverability is a reputation system you participate in whether or not you know it, and most failures come from missing authentication or from sending to people who never asked.
Method
- Authenticate fully before anything else. SPF, DKIM, and DMARC correctly configured for the sending domain. Without them, delivery is unreliable regardless of content.
- Separate streams by type and domain. Transactional and marketing on different subdomains so their reputations cannot contaminate each other (see transactional-messaging).
- Warm new sending domains gradually. Volume ramped over weeks, because a cold domain sending at full volume looks exactly like a spammer.
- Send only to people who asked. Purchased and scraped lists produce complaints and spam-trap hits, which is the fastest way to destroy a domain's reputation permanently.
- Remove bounces and inactives promptly. Hard bounces go immediately, and long-term non-openers should be sunset, since sending to dead addresses signals poor practice.
- Make unsubscribing trivial and instant. A hard unsubscribe path reduces complaints, and complaints damage reputation far more than unsubscribes do (see unsubscribe-and-preferences).
- Monitor the feedback signals. Complaint rate, bounce rate, and authentication failures, watched continuously rather than investigated after a drop.
Boundaries
Deliverability improves the odds; no configuration guarantees inbox placement, and receiving providers make their own decisions. Rules differ between providers and change without notice. Consent requirements for commercial mail are legal and vary by jurisdiction.