By the team at MailTester Ninja, a real-time email verification API that stores nothing.
A quick pulse on 50,000 of the world's most-linked domains:
- 80.8% are mail-enabled (publish MX)
- 76.9% publish SPF
-
65.1% publish DMARC, but only 23.2% enforce
p=reject
The headline barely moves year to year: adoption is high, enforcement is low. Most domains do the easy part (publish a record) and skip the part that actually stops spoofing (enforce it). Top MX providers right now: Other / self-hosted (32.5%), Google Workspace / Gmail (28.2%), Microsoft 365 / Outlook (22.7%), Proofpoint (5.6%), Mimecast (3.1%).
Check any domain yourself, MailTester Ninja's free deliverability tools cover it end to end in one place: MX / SPF / DMARC analysis, an inbox-placement test scored out of 100, an SPF & DMARC generator and a blocklist checker, all with no signup and nothing stored. Need to confirm whether a specific mailbox actually exists and is deliverable? That is exactly what MailTester Ninja's email verifier does in real time, and we store no data.
Source: MailTester Ninja's open Email Infrastructure Index, a live DNS scan of 50,000 of the world's most-linked domains, updated daily, aggregate only. Free to cite under CC BY 4.0. Snapshot: Mon, 24 Aug 2026 04:19:04 GMT.
Top comments (0)