Google 管理员工具箱 电子邮件标头分析工具
https://toolbox.googleapps.com/apps/messageheader/
电子邮件标头可以确定邮件会发往何处，并记录邮件在通过每个邮件服务器时所选取的特定路径。
如果您希望自行读取邮件标头，请从标头底部开始，一路向上阅读，按时间顺序跟踪邮件的路径。
下面的示例是一封从 MrJones@emailprovider.com 发往 MrSmith@gmail.com 的电子邮件的邮件标头：
Delivered-To: MrSmith@gmail.com
Received: by 10.36.81.3 with SMTP id e3cs239nzb; Tue, 29 Mar 2005 15:11:47 -0800 (PST)
Return-Path:
Received: from mail.emailprovider.com (mail.emailprovider.com [111.111.11.111]) by mx.gmail.com with SMTP id h19si826631rnb.2005.03.29.15.11.46; Tue, 29 Mar 2005 15:11:47 -0800 (PST)
Message-ID: <20050329231145.62086.mail@mail.emailprovider.com>
Received: from [11.11.111.111] by mail.emailprovider.com via HTTP; Tue, 29 Mar 2005 15:11:45 PST
Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
From: Mr Jones
Subject: Hello
To: Mr Smith
此例中，标头会三次添加到邮件中：
- 当 Jones 先生撰写电子邮件时
Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
From: Mr Jones
Subject: Hello
To: Mr Smith - 当电子邮件通过 Jones 先生的电子邮件提供商的服务器 mail.emailprovider.com 发送时
Message-ID: <20050329231145.62086.mail@mail.emailprovider.com>
Received: from [11.11.111.111] by mail.emailprovider.com via HTTP; Tue, 29 Mar 2005 15:11:45 PST - 当邮件从 Jones 先生的电子邮件提供商传输到 Smith 先生的 Gmail 地址时
Delivered-To: MrSmith@gmail.com
Received: by 10.36.81.3 with SMTP id e3cs239nzb;Tue, 29 Mar 2005 15:11:47 -0800 (PST)
Return-Path: MrJones@emailprovider.com
Received: from mail.emailprovider.com (mail.emailprovider.com [111.111.11.111]) by mx.gmail.com with SMTP id h19si826631rnb; Tue, 29 Mar 2005 15:11:47 -0800 (PST)
以下是对电子邮件标头的每一部分的说明：
Delivered-To: MrSmith@gmail.com
邮件将送达的电子邮件地址。
Received: by 10.36.81.3 with SMTP id e3cs239nzb;
Tue, 29 Mar 2005 15:11:47 -0800 (PST)
邮件到达 Gmail 服务器的时间。 Return-Path:
发送邮件的地址。
Received: from mail.emailprovider.com
(mail.emailprovider.com [111.111.11.111])
by mx.gmail.com with SMTP id h19si826631rnb.2005.03.29.15.11.46;
Tue, 29 Mar 2005 15:11:47 -0800 (PST)
这封邮件发自 mail.emailprovider.com，由 Gmail 服务器在 2005 年 3 月 29 日约下午 3 点接收。 Message-ID: 20050329231145.62086.mail@mail.emailprovider.com
这是 mail.emailprovider.com 分配的用于标识这封邮件的唯一编号。 Received: from [11.11.111.111] by mail.emailprovider.com via HTTP;
Tue, 29 Mar 2005 15:11:45 PST
Jones 先生使用某个电子邮件撰写程序撰写这封邮件，然后将其发送到 mail.emailprovider.com 的电子邮件服务器。
Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
From: Mr Jones
Subject: Hello
To: Mr Smith
日期、发件人、主题和说明：Jones 先生在撰写这封电子邮件时输入了这一信息（日期除外）。
References:
https://toolbox.googleapps.com/apps/messageheader/analyzeheader
https://support.google.com/mail/answer/29436?hl=zh-Hans
