When I send this plain text email, with the following subject line : "Répondre xxx #today *projectxxx", I get the following task : "=?iso-8859-1?Q?R=E9pondre_www_#today_*projectxxx?="
As you can see, I use accented characters from time to time.
I am using Outlook and a plain vanilla SMTP server, with no redirections whatsoever.