SMTP MTA Strict Transport Security
Google, Inc
Google, Inc
Google, Inc
Google, Inc
Google, Inc
Comcast, Inc
Microsoft, Inc
LinkedIn
SMTP MTA-STS is a mechanism enabling mail service providers to declare their ability to receive TLS-secured connections, to declare particular methods for certificate validation, and to request that sending SMTP servers report upon and/or refuse to deliver messages that cannot be delivered securely.