How to color code my external emails in exchange 2010,2016 and Office 365

Hi all, I would like to color code all my external emails coming to my organisation. Am aware that I can do it via Conditional formatting in outlook. But I would like to push it to the entire organisation. is there a way in GPO? do we have any 3rd party tool to do this?  
Please advice.
Tech geekAsked:
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Vasil Michev (MVP)Commented:
Not that I know of. There are no GPO setting to control this, and afaik those settings are stored in the mailbox profile, not on the machine, so you cannot copy registry or config files.
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Tech geekAuthor Commented:
Hi Vasil thank you for your response. Do we have any third party tool which can do this? or can we do something at the transport rules in the exchange server 2010 or 2016?
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Vasil Michev (MVP)Commented:
Transport rules do not offer anything related to this, it's a client-side functionality. Not sure about 3rd party tools., I havent seen any, but you can do a quick lookup in the Office marketplace or google...
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David Johnson, CD, MVPOwnerCommented:
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David Johnson, CD, MVPOwnerCommented:
enough information to confirm an answer
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