Email Deliverability
Email deliverability is the ability of your messages to reach subscribers' inboxes rather than landing in spam or being blocked outright by the receiving mail server. It reflects how mailbox providers judge your sending, based on reputation, authentication, list quality, and recipient engagement, and determines whether the people you email actually see it.
It differs from the simpler "delivery rate," which only counts whether a server accepted a message at all, not where it ended up. Strong deliverability rests on authentication records (SPF, DKIM, and DMARC), a clean and consented list, consistent sending volume, and good engagement such as opens and clicks.
A common pitfall is mailing stale or purchased lists, which drives bounces and spam complaints that damage sender reputation and can land even legitimate mail in spam. Related terms include hard bounce, soft bounce, and double opt-in.
Last updated: 14 June 2026