I have created a mailing list "firstname.lastname@example.org" and have been using that without much issues. But I just noticed that if I put international language (e.g. Chinese) in as the subject, the message will simply disappear (undelivered without any error messages). Could this be due to exiscan? And if so, how can I remove the filter for exiscan. It doesn't seem to have a config file like MailScanner.