或者分析投递途径, 比如我收到的这封信看起来是从美国加州一公司发的, 其实是从福建龙岩发的。
X-FROMIP: 64.34.182.212
X-EQManager-Scaned: 1
X-Received:www.puristat.com,64.34.182.212,20080723233750
Received: from www.puristat.com (HELO puristat.com) (64.34.182.212)
by localhost with SMTP; 23 Jul 2008 15:37:50 -0000
Received: from gkpva [59.58.242.223] (!!!!)by puristat.com with ESMTP
(SMTPD-9.20) id AF28025C; Wed, 23 Jul 2008 11:32:56 -0400