如何让GMail继续对话？

Question

提供同一主题时不起作用？

我想发送2封电子邮件，让它们出现在一个对话中。可悲的是，第二个总是开始一个新的对话。怎么避免这个？

这两封邮件都会直接发送到my.address@gmail.com

两者都具有几乎相同的标题和相同的UTF-8编码主题：

Delivered-To: my.account@gmail.com
Received: by ...
Return-Path: ...
Received: ...
Received-SPF: pass ...
Authentication-Results: mx.google.com; spf=pass ...
Received: from mm_www by ...
To: my.account@gmail.com
Subject: =?UTF-8?...=?=
From: notification@my.domain
Content-Type: text/plain; charset=UTF-8; format=flowed
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-Mailer: PHP
Message-Id: ... (Different for both messages. Should I add my own id?)
Date: ...

任何线索？

Answer 1

是的，消息ID在这里很重要。客户端使用它来确定流量。