User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 Build ID: 20111220165912 Steps to reproduce: Type an e-mail ("Compose emails in HTML format" is checked). My default font is Verdana. Actual results: In my email composition window in Thunderbird, the text in my emails are all always in one font. However, when people respond to my e-mails, many times in their quote of my e-mail, I see that in the beginning of the email the font is Verdana, as it should be, but then in seemingly random positions in the quote, the font changes to a totally different one, such as Arial or Times New Roman -- even though it didn't appear this way in my composition window when I was composing the email. Expected results: The text in recipient's copy of my e-mail should be all in the same font, as it appeared in my composition window. This has occurred for as long as I can remember, including the latest version (9.0.1).
(In reply to Cngevpxhaqrefpber from comment #0) Can you BCC yourself when you send emails and check the email you receive?
I was actually able to go back through my sent folder and find the problem. When I looked at the message sources of the e-mails in question (the ones that, when quoted by the person I was corresponding with, the font would change seemingly randomly in their reply) and I found that it looks something like this: <font face="Verdana">Blah blah blah</font> ABCDEFG. With "blah blah blah" being in the correct font, and ABCDEFG being in a different font, when shown in the quote, or viewing my sent folder from Gmail. When I view the e-mail in my sent folder in Thunderbird however, the e-mail looks just fine. I'm not sure if this is relevant or not, but my Send Options / Text Format is set to "Send the message in both plain text and HTML". Let me know if you need anything else.
Thanks, I didn't read the whole thread of comments, but comment 71 there seems to describe the issue I'm experiencing. I tried clicking around at the end of the line and elsewhere in the e-mail composition window as he described and I was able to reproduce the problem. I'm not sure if that's the only thing that has caused the issue for me in the past, but it did just now.