Pro doplnění - Mercury tam IP adresu píše od verze 1.32 z roku 1997, viz:
Received: from prg.traveller.cz by ryston.cz (Mercury 1.31) with ESMTP;
30 Sep 97 22:01:35 +1000
Received: from starnine.com (198.211.93.1) by ryston.cz (Mercury 1.32) with ESMTP;
29 Nov 97 18:11:39 +0100