Return-Path: <one@foo.com>
From: One <one@foo.com>
To: team@bar.com
Cc: two@foo.com, three@foo.com
Subject: Testing email threading
Date: Fri, 15 Jan 2016 00:12:43 +0100
Message-ID: <34@foo.bar.mail>
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is email reply **1**.