Using Usermin 1.470, configured with the language in en.utf-8 and to send email using utf-8.
On receiving a iso-2022-jp encoded message (which displays fine), I then choose reply to all. Some of the email addresses in the CC section are preceded by Japanese characters. On viewing the page encoding, the main frame is UTF8 as expected and the inner frame for replying to the email shows an encoding of ISO-2022-JP. This is all fine and displays correctly.
However, when sending this email, the output from looks a bit mangled and I receive an undelivered email message from the mail server with the following details:
Final-Recipient: rfc822; =?ISO-8859-1?Q?=20?='?$B9b@%?
Diagnostic-Code: X-Postfix; bad address syntax
Output from send:
Sending mail to User One <user1@someplace> , "$B%A%$%O%-(B"<user2@someplace> , "$B%=%R%3%=%R%3(B" <user3@someplace> ..
The email is only sent to recipients listed before the ones with japanese encoded characters.