B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Current

45%

45% -- mta sts deployments in testing mode for Top-1M MTA-STS deployments (2026-01)

Name: Mta Sts Deployments In Testing Mode Statistics
Creator: Lighthouse Intelligence
Published: 2026-10-02

2026-01 · URIports

Approximately 45% of MTA-STS-publishing domains in the top 1M are configured in testing mode according to URIports' January 2026 survey.

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Attribution: URIports View source

Lighthouse Research Team

Last verified: 2026-10-02 · How we verify data →

Source verified Evidence graded

Value

45%

Unit

Percentage

Data Vintage

2026-01

Entity

Top-1M MTA-STS deployments

Evidence Quality

Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

61/100 confidence

Single source - not yet corroborated

Score breakdown

Extraction

Source Trust

Citation Chain

Independence

Methodology

Freshness

Source

URIports Primary Tier B

https://dmarcguard.io/blog/mta-sts-example/ ↗

Confidence: 28/100 Vintage: 2026-01 Channel: Deep Crawl

Source Article

MTA-STS Example: Working Policy File & DNS Record [2026] | DMARCguard

MTA-STS Example: A Working Policy File and DNS Record (RFC 8461) MTA-STS adoption sits at 0.3% — 15,997 of 5,499,028 domains scanned by DMARCguard’s first-party study. The blocker is rarely the protocol; it is the absence of a copy-pasteable example. Below are two artefacts you can publish today for…

Original Research

URIports · Original study ↗

Methodology

URIports top-1M domain survey

Methodology documented

Segmentation

IndustryMedia RoleAll marketers Channelcontent

Cite this stat

Plain Text

Top-1M MTA-STS deployments: 45% mta sts deployments in testing mode. Source: URIports (2026-01). Via Lighthouse Intelligence -- https://lighthousedata.io/data/mta-sts-testing-mode-top1m-2026

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<blockquote cite="https://lighthousedata.io/data/mta-sts-testing-mode-top1m-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>45%</strong> -- mta sts deployments in testing mode for Top-1M MTA-STS deployments<br><small>Source: URIports (2026-01) · <a href="https://lighthousedata.io/data/mta-sts-testing-mode-top1m-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>

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