Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Archived

Thunderbird is defaulting to plain text for email composition

ltwolle

Hello all!

I use Thunderbird's desktop application for work. The problem that I'm having with Thunderbird is in regards to email composition. Every email defaults to plain text (new emails, replies, etc.) despite the following: settings > composition > sending format: "HTML only." I have restarted the application as well as my computer to allow for any setting changes to take effect.

I would prefer rich text or HTML, especially since my signature is in HTML format and it looks awful in plain text.

Please let me know what additional information I can provide. Thank you in advance for your help!

Hello all! I use Thunderbird's desktop application for work. The problem that I'm having with Thunderbird is in regards to email composition. Every email defaults to plain text (new emails, replies, etc.) despite the following: settings > composition > sending format: "HTML only." I have restarted the application as well as my computer to allow for any setting changes to take effect. I would prefer rich text or HTML, especially since my signature is in HTML format and it looks awful in plain text. Please let me know what additional information I can provide. Thank you in advance for your help!

All Replies (1)

Account Settings, Composition & Addressing, Composition. 'Sending format' is different.