''trbuttner [[#question-1260042|said]]'' <blockquote> I have used Mozilla Thunderbird for my email for years and recently it adds question marks to my emails. Can you tell me how to stop the question marks from showing up? </blockquote> Hello trbuttner, Would you try this please : Go to the Configuration Editor (Tools, Options, Advanced, General, Config Editor). Scroll down to '''mail.strictly_mime''' Click on it and change it from "false" to '''true'''. If these question marks appear after (e.g.) two spaces, then this should do the trick .....