Why when sending email in thunderbird it also sends a blank reply? All settings are turned off for return receipt and reply.

When I send an email in Thunderbird a blank Re: is sent separately. Here is an example of the message source.
x-store-info:J++/JTCzmObr++wNraA4Pa4f5Xd6uensap63oRXCTMUTUEvj6APPRTxTcWsw8dQv58bFGxaFgWdTHBE67XKyo9q320PuXIoKGa1IZwnrimJWvBIlyPavCV+8dEB0XthIJ0HJiLn1uWo=
Authentication-Results: hotmail.com; spf=none (sender IP is 66.96.190.1) smtp.helo=bosmailout01.eigbox.net; dkim=none header.d=tcpest.com; x-hmca=none header.id=[email protected]
X-SID-PRA: [email protected]
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w
X-Message-Info: NhFq/7gR1vTj2Z7xd9Dl7oRrPhojm9WYwfEapXrOg3QE6RzCV8K92G3WeTluMWd6xtAKmeQAKChH9XGOTBHE3qPh+FzXp837PkkXeJqieQthpxjcm3ClsTgqTRBh0RoP5G/vf5Ag8b608g2/sR8QFusgfVoWu2aDnuILKayd/P0xbTfJcdZzHST4Ugx9ZsTx04fKolDq0wCcdzf4ePQHEXM6nUfRr34Y
Received: from bosmailout01.eigbox.net ([66.96.190.1]) by COL004-MC3F54.hotmail.com with Microsoft SMTPSVC(7.5.7601.23008);
Fri, 10 Apr 2015 05:52:48 -0700
Received: from bosmailscan06.eigbox.net ([10.20.15.6])
by bosmailout01.eigbox.net with esmtp (Exim)
id 1YgYQQ-0006mH-EM
for [email protected]; Fri, 10 Apr 2015 08:52:46 -0400
Received: from Debian-exim by bosmailscan06.eigbox.net with local (Exim)
id 1YgYQQ-0005V0-D0
for [email protected]; Fri, 10 Apr 2015 08:52:46 -0400
From: [email protected]
To: [email protected]
Subject: Re: Your mail to [email protected]
In-Reply-To: <[email protected]>
References: <[email protected]>
Auto-Submitted: auto-replied
Message-Id: <[email protected]>
Date: Fri, 10 Apr 2015 08:52:46 -0400
Return-Path: <>
X-OriginalArrivalTime: 10 Apr 2015 12:52:48.0940 (UTC) FILETIME=[3FA97EC0:01D0738D]

''tcpest [[#question-1056933|said]]''
<blockquote>
When I send an email in Thunderbird a blank Re: is sent separately. Here is an example of the message source.
x-store-info:J++/JTCzmObr++wNraA4Pa4f5Xd6uensap63oRXCTMUTUEvj6APPRTxTcWsw8dQv58bFGxaFgWdTHBE67XKyo9q320PuXIoKGa1IZwnrimJWvBIlyPavCV+8dEB0XthIJ0HJiLn1uWo=
Authentication-Results: hotmail.com; spf=none (sender IP is 66.96.190.1) smtp.helo=bosmailout01.eigbox.net; dkim=none header.d=tcpest.com; x-hmca=none header.id=[email protected]
X-SID-PRA: [email protected]
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w
X-Message-Info: NhFq/7gR1vTj2Z7xd9Dl7oRrPhojm9WYwfEapXrOg3QE6RzCV8K92G3WeTluMWd6xtAKmeQAKChH9XGOTBHE3qPh+FzXp837PkkXeJqieQthpxjcm3ClsTgqTRBh0RoP5G/vf5Ag8b608g2/sR8QFusgfVoWu2aDnuILKayd/P0xbTfJcdZzHST4Ugx9ZsTx04fKolDq0wCcdzf4ePQHEXM6nUfRr34Y
Received: from bosmailout01.eigbox.net ([66.96.190.1]) by COL004-MC3F54.hotmail.com with Microsoft SMTPSVC(7.5.7601.23008);
Fri, 10 Apr 2015 05:52:48 -0700
Received: from bosmailscan06.eigbox.net ([10.20.15.6])
by bosmailout01.eigbox.net with esmtp (Exim)
id 1YgYQQ-0006mH-EM
for [email protected]; Fri, 10 Apr 2015 08:52:46 -0400
Received: from Debian-exim by bosmailscan06.eigbox.net with local (Exim)
id 1YgYQQ-0005V0-D0
for [email protected]; Fri, 10 Apr 2015 08:52:46 -0400
From: [email protected]
To: [email protected]
Subject: Re: Your mail to [email protected]
In-Reply-To: <[email protected]>
References: <[email protected]>
Auto-Submitted: auto-replied
Message-Id: <[email protected]>
Date: Fri, 10 Apr 2015 08:52:46 -0400
Return-Path: <>
X-OriginalArrivalTime: 10 Apr 2015 12:52:48.0940 (UTC) FILETIME=[3FA97EC0:01D0738D]
</blockquote>

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