==== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 14.04 LTS
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Hi there, i have a strange issue that I have managed to narrow down to Microsoft Outlook. When I send HTML emails via either Outlook (tested with 2010 and 2013) they received a lower score on mail-tester.com with this message:

-1.985 PYZOR_CHECK Listed in Pyzor (http://pyzor.sf.net) 
 
However, if I use outlook and only send plain text emails or if I use Mac Mail (HTML email) or Mozilla Thunderbird (HTML email) the negative mark does not appear. So I am confident it is directly linked to Outlook. 
 
I am completely stuck as to what I can do about this - we need to be able to send HTML emails and we need to use Outlook, so I come hat in hand, on my knees and plead for help!! 
 
Thank you