I don't see this addressed recently and the fixes from previous versions don't work. Using Thunderbird 140.5.0esr (64-bit) on Mac OS Monterey 12.7.6. Since T-bird updated I have not been able to change font colors or highlight font any outgoing email and I can't see colors in my incoming emails. I can copy and paste incoming emails into a word document and the color formatting shows up. If I write an email in a word document, change the color then copy and paste this into an outgoing email it reverts to black font. I can change bold/italic/underline. I disabled my two extensions and tried again - no change either sending or viewing received colors Under Settings > Composition > HTML Style "Use reader’s default colors" is checked and under > Sending Style "Both HTML and Plain Text" are checked I'm missing something here but can't figure it out!