Comment 0 for bug 145429

User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3
Build Identifier: Thunderbird 2.0.0.0 Mac

My standard encoding for mail is ISO-8859-1. When sending mail with Unicode characters in the mail body TB asks me, if I want to send this mail in UTF. This is perfect and works.

But when only the subject line contains Unicode characters but the message body is with Western chars, then the mail gets send without asking me and the mail's subject line is not UTF encoded. Result: the subject line is a lot of ??????????? (question marks).

Example:

1. Set your standard mail encoding in Thunderbird ISO-8859-1
2. Use Firefox and go to http://foxkeh.jp/
3. Use "Menu > File > Send Link"
4. Now a mail compose window opens in Thunderbird, the subject is in Japanese, the Body is only the URL
5. Mail it to yourself
6. Now you see instead of the Japanese subject line lots of ????????????, the subject line was sent not UTF encoded in ISO-8859-1

Reproducible: Always

Expected Results:
TB should encode the subject header UTF when it contains UTF characters, even when the mail body contains no UTF chars.