--- Only allow encrypted streams? Encryption is already used when
--- available. These options will cause Prosody to deny connections that
--- are not encrypted. Note that some servers do not support s2s
--- encryption or have it disabled, including gmail.com and Google Apps
--- domains.
+-- Force clients to use encrypted connections? This option will
+-- prevent clients from authenticating unless they are using encryption.
+
+c2s_require_encryption = true
+
+-- Force certificate authentication for server-to-server connections?
+-- This provides ideal security, but requires servers you communicate
+-- with to support encryption AND present valid, trusted certificates.
+-- NOTE: Your version of LuaSec must support certificate verification!
+-- For more information see http://prosody.im/doc/s2s#security
+
+s2s_secure_auth = false
+
+-- Many servers don't support encryption or have invalid or self-signed
+-- certificates. You can list domains here that will not be required to
+-- authenticate using certificates. They will be authenticated using DNS.
+
+--s2s_insecure_domains = { "gmail.com" }
+
+-- Even if you leave s2s_secure_auth disabled, you can still require valid
+-- certificates for some domains by specifying a list here.