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Confirming subscription true reply

Any idea how to solve this?

Below you can see the details of the mail I received

To confirm that you would like 
s7ygewgdnexobe5vr2@thrott.com 

added to the newsletter mailing list, please send an empty reply to this address: 
newsletter-sc.1469771627.plmaaohfklelbphmfngl-s7ygewgdnexobe5vr2=thrott.com@list.howto-outlook.com 

Usually, this happens when you just hit the "reply" button. 
If this does not work, simply copy the address and paste it into the "To:" field of a new message. 

This confirmation serves two purposes. First, it verifies that I am able to get mail through to you. Second, it protects you in case someone forges a subscription request in your name. 


If you need to get in touch with the human owner of this list, please send a message to: 
<feedback@howto-outlook.com>


--- Below is a copy of the original message request. 
Return-Path: <s7ygewgdnexobe5vr2@thrott.com>
Received: (qmail 11876 invoked by uid 399); 29 Jul 2016 05:53:47 -0000 
Received: from unknown (HELO how01.hosting.nl) (62.129.149.131) 
(de-)crypted with TLSv1: DHE-RSA-AES256-SHA [256/256] DN=unknown 
by mail3.hosting.nl with ESMTP; 29 Jul 2016 05:53:47 -0000 
X-Originating-IP: 62.129.149.131 
Received-SPF: none (mail3.hosting.nl: domain at thrott.com does not designate permitted sender hosts) 
identity=mailfrom; client-ip=62.129.149.131; 
envelope-from=<s7ygewgdnexobe5vr2@thrott.com>; 
Received: by how01.hosting.nl (Postfix, from userid 10002) 
id 4CD8F2409A7; Fri, 29 Jul 2016 07:52:52 +0200 (CEST) 
To: newsletter-subscribe@list.howto-outlook.com 
Subject: Subject: subscribe to newsletter 
X-PHP-Originating-Script: 10002:template-signup.php 
From: s7ygewgdnexobe5vr2@thrott.com 
Reply-To: s7ygewgdnexobe5vr2@thrott.com 
X-Mailer: PHP/7.0.9 
Message-Id: <20160729055252.4CD8F2409A7@how01.hosting.nl> 
Date: Fri, 29 Jul 2016 07:52:52 +0200 (CEST) 

Please subscribe me to the newsletter