Hi,
I had problems with emails that were translated over admin panel, and special characters (čšž) in title didn't show properly.
Here is the FIX in email mime.php file. Edit file -> include/pear/Mail/mime.php (line: 179)
function Mail_mime($crlf = "\r\n") {
$this->_setEOL($crlf);
$this->_build_params = array(
'head_encoding' => 'quoted-printable',
'text_encoding' => '7bit',
'html_encoding' => 'quoted-printable',
'7bit_wrap' => 998,
'html_charset' => 'UTF-8', //ISO-8859-1
'text_charset' => 'UTF-8', //ISO-8859-1
'head_charset' => 'UTF-8' //ISO-8859-1
);
}