Skysnag Research
MTA-STS forces encrypted (TLS) delivery to your domain and reports failures. We measured how many of the top domains in each country publish it — and how many only test it instead of enforcing.
MTA-STS only protects delivery when its policy is in enforce mode. In testing mode it merely reports — a common half-measure. The table below separates the two, so “adoption” isn’t mistaken for protection.
| Country | Enforce | Testing |
|---|---|---|
| the United Kingdom | 10% | 3% |
| Germany | 4% | 3% |
| Norway | 4% | 1% |
| Australia | 3% | 2% |
| the Netherlands | 2% | 2% |
| Switzerland | 2% | 2% |
| Sweden | 2% | 2% |
| Brazil | 1% | 1% |
| Canada | 1% | 1% |
| Belgium | 1% | 1% |
| Denmark | 1% | 1% |
| the United Arab Emirates | 1% | 2% |
| Saudi Arabia | 1% | 0% |
| Austria | 1% | 0% |
| Finland | 1% | 0% |
| France | 0% | 1% |
| Italy | 0% | 0% |
| Spain | 0% | 0% |
| Japan | 0% | 0% |
| India | 0% | 0% |
| Poland | 0% | 0% |
Top domains per country by authority ranking, live-checked November 2026. Mini-bars scaled ×5 for visibility (adoption is in single digits).
Deploy MTA-STS and TLS-RPT without the manual work.
See how Skysnag automates it →
