Ejemplo de cabeceras Received RFC 822

Received: from smtpout.example.com (smtpout.example.com [169.254.122.45])
           by mx.google.com with ESMTP id 128eb3397b49wid.27.2012.12.13.03.32.36;
           Thu, 13 Dec 2012 03:32:37 -0800 (PST)
Received: from smtprelay.example.com (smtprelay.example.com [172.20.2.100])
           by smtpout.example.com (Postfix) with ESMTP id 975280C7D6E
           for <nobody@gmail.com>; Thu, 13 Dec 2012 11:32:29 +0000 (UTC)
Received: from smtpuser.example.com (smtpuser.example.com [10.110.0.55])
           by smtprelay.example.com (Postfix) with ESMTP id 7FAAAA33E49
           for <nobody@gmail.com>; Thu, 13 Dec 2012 11:32:29 +0000 (UTC)