I ran into a strange issue the other day. Our client said every time she replied to an email in Outlook her font would change to a different color. The version of Outlook my client was using was Outlook 2013 , but this “fix” will also work for Outlook 2016. I got to digging around a bit in Outlook 2013 and I found this was actually a “feature” instead of a problem.
If you find you font automatically changing on you, when replying to email messages, this is where you need to go to turn it off.
Step One: Open Outlook. Go to File > Options > Mail > Stationary and Fonts > Uncheck “Pick a new color when replying or forwarding”. Click OK.
I hope this help you! This was posted by techspeeder. Follow my blog or my Twitter feed to keep up with the latest troubleshooting tips.