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Marketing Glossary· DELIVERABILITY

What is Email Deliverability?

By Nikhil Sharma · Updated 1 November 2026 · Marketing Glossary
Definition

Email Deliverability is the ability of your emails to actually reach recipients’ inboxes — rather than landing in spam or being blocked — and it determines whether your email marketing works at all.

What is email deliverability?

You can write the perfect email, but if it lands in spam it earns nothing. Deliverability is the set of technical and reputational factors that decide whether mailbox providers place your email in the inbox. It underpins every drip campaign and newsletter.

What affects it

  • Authentication — SPF, DKIM and DMARC records proving you’re legitimate.
  • Sender reputation — your domain/IP history.
  • List quality — engaged, opted-in contacts; low bounces/complaints.
  • Content & engagement — spammy content and ignored emails hurt.

How to improve it

Set up SPF, DKIM and DMARC; only email people who opted in; keep lists clean (remove hard bounces and dormant contacts); and send relevant content people engage with. High engagement signals the inbox you’re wanted.

Related terms
Drip CampaignCRMLead NurturingPersonalizationCustomer Retention
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Written & reviewed by Nikhil Sharma
Founder, Fabulous Media
Nikhil has led growth for 850+ brands across 35 nations since 2008. Fabulous Media is an invitation-only growth agency that reports on pipeline and revenue, not vanity metrics. Meet the team · Request an invite.

Questions, answered

It is the ability of your emails to reach recipients' inboxes rather than landing in spam or being blocked. Even great emails earn nothing if they don't get delivered, so it underpins all email marketing.

Authentication (SPF, DKIM, DMARC), your sender reputation, list quality and engagement, and content. Spammy content, unengaged lists and high bounce or complaint rates all hurt it.

Set up SPF, DKIM and DMARC, email only opted-in contacts, keep your list clean by removing bounces and dormant contacts, and send relevant content people actually open and engage with.

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