How to Improve Email Deliverability: A 2026 Checklist
A practical checklist to improve email deliverability: authentication, list hygiene, sending habits and reputation, with the tools to check each one.
Deliverability is whether your email actually reaches the inbox. It is not one setting but the sum of several, and this checklist walks through the ones that matter most.
Start with the fundamentals
The email deliverability hub explains how these pieces fit together, and the free checkers below test each one.
1. Authenticate your domain
Publish and validate SPF, DKIM and DMARC. These let mailbox providers confirm your mail is legitimate, and missing or broken records are a common reason mail goes to spam. Need to create them? Use the SPF generator and DMARC generator.
2. Verify your list
Sending to invalid addresses drives bounces that wreck your reputation. Verify before every send and verify new signups in real time. This is the highest-impact step for most senders.
3. Mind your sending habits
- Warm up new domains and IPs gradually rather than blasting volume on day one.
- Send consistently instead of in unpredictable spikes.
- Make unsubscribing easy, because spam complaints hurt more than unsubscribes.
4. Earn engagement
Gmail and Outlook weigh how recipients interact with your mail. Send relevant content to people who want it, and prune unengaged contacts. For benchmarks to measure against, see our deliverability statistics.
5. Monitor and fix
Watch your bounce and complaint rates, check whether you are blacklisted, and act fast when something slips. Deliverability is ongoing maintenance, not a one-time setup.
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