Maildir flags were fixed in Version 3.11, 2020-12-23 of upstream http://git.savannah.gnu.org/cgit/mailutils.git/plain/NEWS?id=c8f80734251804f25247fc3b3a234e990a217b57
(And I can confirm this works) KJ -- http://stopstopnop.pl/stop_stopnop.pl_o_nas.html
