11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
log elements QT, DT and D, and timstamps in debug output.
+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. 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
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