Deliverability is whether your email reaches the inbox rather than the spam folder. The single biggest factor you control is domain authentication.
Running the check:
Go to AI Mailer, then Deliverability. Enter your domain and click the check button. The plugin looks up your DNS and reports on four things, with an overall score out of one hundred.
What each record does:
- SPF lists which mail servers are allowed to send as your domain. Without it, anyone can forge your address.
- DKIM cryptographically signs your emails so the receiving server can prove they were not tampered with in transit.
- DMARC tells receiving servers what to do when SPF or DKIM fails, and where to send reports about it.
- MX records say where email addressed to your domain should be delivered.
Fixing failures:
All of these are DNS records, added wherever your domain is managed, such as your registrar or Cloudflare. Your sending provider gives you the exact values to add. Amazon SES, Postmark, SendGrid and the others all have a domain verification screen that shows the records you need.
DNS changes can take a few hours to propagate. Re-run the check the next day rather than expecting an instant result.
The suppression totals:
Below the check, the screen shows how many addresses are suppressed and why, split into unsubscribed, bounced, complained and manually added. Watching bounced and complained over time is a good early warning system: a sudden rise usually means a list quality problem.
A practical rule:
Sort out authentication before your first big send, not after. Reputation is much easier to protect than to repair.