Duplicate of http://stackoverflow.com/questions/372449/header-in-gmail-for-thread-hinting
... when providing the same subject line doesn't work?
I'd like to send 2 emails and make them appear in one conversation. Sadly, the second one always starts a new conversation. How to avoid this?
Both mails are sent directly to [email protected]
Both have almost the same headers and the same UTF-8 encoded subjects:
Delivered-To: [email protected] Received: by ... Return-Path: ... Received: ... Received-SPF: pass ... Authentication-Results: mx.google.com; spf=pass ... Received: from mm_www by ... To: [email protected] Subject: =?UTF-8?...=?= From: [email protected] 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: ...
Any clues?