The goal is to transplant the concepts of HTTP Strict Transport Security (HSTS)[^1] and Public Key Pinning Extension for HTTP[^2] to other protocols that support TLS. We aim to do those for popular internet protocols like SMTP, POP, FTP, XMPP and IRC.
- Identify status codes that are currently undefined and can be safely ignored by clients that do not support them
- In this status code, the server SHOULD send a list of tokens to describe it's Enhanced TLS Security settings. 2.1 foo