Another quick fix for emails out
As the previous work around concerning email reception and storage in utf8, this workaround will let the clients receive emails from osTicket without breaking the special characters.
In /include/class.misc.php replace line 69 by this one:
mail($to,utf8_decode($subject),utf8_decode($message),trim($headers));
Again, this is only a work around. A more global fix must be done in order caracter encodings in general.