Email deliverability
My domain cannot receive email
What 13x checks
This is rule deliverability.mx in the public registry: The domain can receive mail. It runs on every audit, against the pages we actually fetched, and its result is derived from the response rather than estimated.
- Surface
- Email deliverability
- Score weight
- 5 of the readiness score
- Scope
- Runs on every audited page
- Applies
- Only where the market or the page shape makes it relevant
Registry version 2026-07-30. Every rule is published, and the audit is deterministic — the same page produces the same finding every time.
The fix
The same text the audit hands you when this check fails on your own site.
Add MX records so the domain can receive mail. For Google Workspace:
Type: MX Name: @ Priority: 1 Value: smtp.google.comFor Microsoft 365:
Type: MX Name: @ Priority: 0 Value: example.com-com.mail.protection.outlook.comIf you do not want a full mailbox, a forwarding-only service (Cloudflare Email Routing, ImprovMX) gives you a working hello@example.com for free — which is enough to satisfy the contact address in your legal pages and to receive replies to your launch announcement.
Sending from a domain that cannot receive also hurts your reputation: receivers treat it as a spam signal.
Does your site have this problem?
13x checks this and 112 others against your live URL in about 30 seconds. No account, and every finding comes with the fix for your framework.
No signup. Results in 30 seconds.