Color code on new message contact (outlook)

To avoid accidentally sending to external recipients, It is possible to differentiate internal and external users by color when send the new email?
Like whoever within organization (based on AD, we use exchange 2010), the color will show as blue color, else show as green color.

Please refer to below: similar case:
https://social.technet.microsoft.com/Forums/exchange/en-US/679e8bd0-6270-4af7-b600-ca1d37ad16dd/show-different-colors-for-different-category-of-contacts-in-the-new-email-interface?forum=exchange2010

Thanks,
patcheahAsked:
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David LeeCommented:
Like whoever within organization (based on AD, we use exchange 2010), the color will show as blue color, else show as green color.

Where is it that you want the color to show?
patcheahAuthor Commented:
Hi BlueDevilFan,

As per attached,

kent cheng => same organization
abctest@yahoo.com => outsider.

I hope the "kent cheng" color can change to blue, and "abctest@yahoo.com" can change to green.
Capture.PNG
David LeeCommented:
If you mean that you want the name/address on the "To" line to change color, then that's not possible.
patcheahAuthor Commented:
The "capture2" is what my boss show us. I am curious how they did.
Black = same organization.
Blue = outsider

Btw, thanks for your reply. At least i have the answer now
capture2.jpg

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