I tried this on my qmail box. When sending to that address from gmail I got back this message "local-part of envelope RCPT address contains utf8 but remote server did not offer SMTPUTF8." Fixing that would probably be a patch.<p>Looking at the maildir created, the directory showed up as ????, if I did a cd to the utf8 string I was able to go into that directory and everything was good. My filesystem is ext4, is there another filesystem that supports utf8 in linux?