12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
while still in SYN_RECV state; as a client logs when the connection
- is opened with a TFO cookie.
+ is opened with a TFO cookie. Support varies between platforms
+ (Linux does both. FreeBSD server only, others unknown).
+
+13. DKIM support for multiple signing, by domain and/or key-selector.
+ DKIM support for multiple hashes.
Version 4.89