(Ubuntu 10.04 · Thunderbird 17.0.5)

I read all my mails as plain text (View → Message Body As → Plain text). Usually they all are in the same font with the same font size:

Thunderbird: mail: screenshot: same/default font

But once in a while I get a mail which is displayed in a different font/font size:

Thunderbird: mail: screenshot: different font

At Edit → Preferences → Display → Formatting → Advanced… I have the same settings for all languages/charsets. I also deactivated "Allow messages to use other fonts".

What is the reason for the font difference?

The encoding of this particular mail seems to be Chinese Simplified (GB2312), at least according to View → Character Encoding. So I changed every font setting for Simplified Chinese (to test it), but nothing changed in the mail.

At this thread the solution (for TB 13) was to change the font settings for Other Languages. But I don't have this option in the list.

  • 1
    Thanks for the "Other Languages" hint. That fixed my problem with font sizes! – Fenikso Sep 22 '15 at 19:38

Possibly you're seeing spam that tries to evade detection with similar-looking letters in faraway Unicode planes, similar to how upside-down text is achieved. Try copy-pasting it inside gedit, which will probably have the same behaviour as Thunderbird (requests a single font but gets a fallback font for rendering unusual characters).

  • 1
    Thanks for this suggestion. In fact this unusual mail is spam. I analyzed some letters with unicode. It tells me that e.g. the "D" in "Dear" is "U+0044 LATIN CAPITAL LETTER D", so nothing unusual, right? FWIW, here is the first line: Dear Purchasing Manager. So looks like the usual chars to me. – unor Apr 16 '13 at 7:41
  • Here is the char analysis (at rishida.net) for the first paragraph: tinyurl.com/thunderbirdfontissue – unor Apr 16 '13 at 7:45
  • Nothing unusual, you're right. It must be Thunderbird-specific. – Tobu Apr 16 '13 at 8:28

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