What is Deliverability?
Whether your emails reach the inbox at all, driven by sender reputation, authentication, and list hygiene.
Deliverability is whether your emails reach the inbox as opposed to spam folders or silent drops. It sits underneath every other newsletter metric: an email that never arrives cannot be opened, clicked, or bought from.
Three forces drive it. Sender reputation reflects how mailbox providers have received your past sends. Authentication records such as SPF, DKIM, and DMARC prove the mail is really from you. List hygiene, meaning low bounces and engaged recipients, signals that people actually want what you send. Established sending platforms handle the technical records; reputation and hygiene remain yours.
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