Created attachment 738462 [details] Image3.bmp User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0 Build ID: 20130409194949 Steps to reproduce: I wrote a new email in only one font type and size. Actual results: After the email was sent, I saw that a part of text the font type and size was changed. This happens very often, and doesn't look good when I write professional emails to companies. Expected results: I hope this bug can be killed, so I can write emails with text in one font and size.
I have the same problem. Very frustrating. Thunderbird 45.5.1 on Linux Ubuntu 16.04 LTS Xenial Xerus.