Return-Path: <one@foo.com>
From: One <one@foo.com>
To: two@foo.com
Cc: team@bar.com, three@foo.com
Subject: RE: Testing email threading
Date: Fri, 15 Jan 2016 00:12:43 +0100
Message-ID: <37@foo.bar.mail>
In-Reply-To: <36@foo.bar.mail>
References: <34@foo.bar.mail>
  <35@foo.bar.mail>
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This is email reply **4**.