Don't have an account? Sign up
If you're already signed up, please sign in
MTA-STS — an SMTP transport-security mechanism that lets a recipient domain publish an HTTPS policy requiring authenticated TLS delivery to approved MX hosts.
The mechanism complements SPF, DKIM, DMARC, or TLS and addresses a separate need, such as preserving authentication through forwarding, validating a brand, defining an encryption policy, or reporting failures. It does not replace baseline email authentication.
MTA-STS — an SMTP transport-security mechanism that lets a recipient domain publish an HTTPS policy requiring authenticated TLS delivery to approved MX hosts.
It conveys an additional verifiable signal between sender and receiver when ordinary authentication or transport encryption is insufficient for a specific delivery scenario.
Establish correct DNS, SPF, DKIM, DMARC, and TLS first, then satisfy the selected specification. Verify reports and actual message headers, not only the presence of a DNS record.
