Thunderbird
Fonts
Fonts and Encodings
../../images/howto/mozilla/thunderbird-fonts.gif
Folders
By default, Thunderbird doesn’t seem to display sub-folders. To subscribe to these folders, right click on the user account and select Subscribe…
Plain Text
To send all e-mails in plain text
Click Tools - Account Settings.
Under the first account on the left, click Composition & Addressing.
Uncheck Compose messages in HTML format (at the top).
Repeat the above 2 steps for each account displayed on the left, then click OK.
Click Tools - Options and then, on the left, click Composition.
Change Forward messages: to Inline (at the top). (This setting causes some forwarded messages to appear at the bottom of the e-mail instead of in a MIME attachment).
Uncheck For messages that contain 8-bit characters… (in the middle)
Once Thunderbird is configured for plain text, holding the Shift key when you click Write, Reply, or Reply to All buttons (but not Forward) will send one e-mail in HTML format.