12 Proven Ways to Improve Email Deliverability

Deliverability is the percentage of your email that actually reaches the inbox — not the spam folder, not blocked. These 12 tactics move that number up.

1. Authenticate everything

SPF, DKIM and DMARC are the foundation. Without them you won't even reach the spam folder reliably. Start with our authentication setup guide.

2. Warm up new IPs and domains

Reputation is earned, not given. Follow a disciplined warmup schedule on any new sending IP.

3. Keep your list clean

Remove hard bounces immediately and prune inactive contacts. Sending to dead addresses spikes bounce rates and signals a stale list.

4. Use double opt-in

Confirmed subscribers engage more and complain less — the strongest positive reputation signal there is.

5. Prioritise engagement

Providers watch opens, clicks, replies and "move to inbox." Send your best content to your most engaged segment first, then expand.

6. Watch your complaint rate

Keep spam complaints under 0.1%. Make unsubscribing easy — a visible unsubscribe beats a "report spam" click every time.

7. Manage bounces properly

Classify hard vs soft bounces and suppress hard bounces automatically. PowerMTA and AutoPMTA do this natively.

8. Set up rDNS

Every sending IP needs a matching PTR record. Missing rDNS is a classic deliverability killer.

9. Balance volume per ISP

Don't flood one provider. Use per-domain throttling to pace Gmail, Outlook and Yahoo separately.

10. Monitor blacklists

Check your IPs and domains against major RBLs regularly. Catching a listing early limits the damage.

11. Write inbox-friendly content

Avoid spam-trigger words, keep a healthy text-to-image ratio, and always include a plain-text part. More in how to avoid the spam folder.

12. Use consistent sending patterns

Steady, predictable volume builds trust. Erratic spikes look like a compromised account.

AutoPMTA's DNS Health and deliverability tools track authentication, blacklists and reputation in real time. See plans.