刪除Exchange郵件頭信息

Exchange保持默認時，收到Exchange發出來的郵件，郵件頭信息例如： Received: from mail1.gov.cn (61.144.58.174) by ItleadMail.itlead.com  (192.168.255.62) with Microsoft SMTP Server (TLS) id 14.1.339.1; Wed, 9 Nov  2011 10:03:03

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