Email Deliverability
The likelihood that a legitimately sent email reaches the recipient's inbox rather than the spam folder or a bounce.
Email deliverability is the practical measure of whether mail that is technically sent actually lands in inboxes. It depends on authentication (SPF, DKIM, DMARC, BIMI), sender reputation (IP and domain), list hygiene (low bounce rate, no spam traps), engagement (opens, replies), content quality, and adherence to mailbox-provider postmaster guidelines. A perfectly RFC-correct message can still go to spam if the sending IP has a poor reputation or the domain has no DMARC alignment. Deliverability work is an ongoing operations discipline, not a one-time setup.
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