Email research and data
SimpleVerifier publishes original measurements from its own checking server and public records. Every study states its sample, date range, method and limitations, and the aggregate data is free to reuse under CC BY 4.0 with a link back to the study.
Reports
Published 12 October 2026 · 10 September to 12 October 2026
Email List Health Report 2026: Catch-All Rates Across 54,463 Domains
27.5% of 54,463 domains accepted mail for a made-up address. Catch-all rates by mail platform, security gateway, host and TLD, from 165,460 SMTP checks.
Data studies
- Common SPF Mistakes: What We Found in 696 Real Company Domains16 of 673 published SPF records needed more than 10 lookups and therefore fail with permerror.
- MTA-STS and TLS-RPT Adoption Among 1,359 Major Domains (2026)58 of 1,359 major domains (4.3%) publish MTA-STS; only 28 enforce a working policy.
- Free Email Provider Domains: A Reference List of 79, Checked79 consumer email domains, all with live MX records on 2 October 2026, none on our 8,740-domain disposable list.
- We Read 19 Email Verifiers' Homepage Claims. Here's What Holds UpEleven of the 19 vendors publish an accuracy figure, and none of them can be checked by a reader.
- Email Verification Pricing Index, October 2026: 19 VendorsVerifying 10,000 email addresses costs between $11.90 and $129 at published prices; verifying 1 million costs between $349 and $3,199.
- Google Workspace vs Microsoft 365: MX Records of 696 Companies93.5% of 200 SaaS companies receive mail directly at Google Workspace.
- DMARC Adoption Among 200 SaaS Companies (October 2026 Data)97% of 200 SaaS companies publish a valid DMARC record, but only 63.5% fully enforce it.
- What 8,740 Disposable Email Domains Have in Common: A Data StudyOnly 4.9% of the 8,740 domains contain an obvious throwaway word like "temp" or "trash".
- How Many Brands Actually Use BIMI? A Check of 1,359 Domains16.9% of S&P 500 companies, 11.5% of SaaS companies and 24.0% of top-site mail domains publish BIMI.