Mine

Oct 24 18:18:04 csaba-laptop postfix/postdrop[1122]: warning: unable to look up public/pickup: No such file or directory
Oct 24 18:18:09 csaba-laptop postfix/postqueue[1124]: fatal: Queue report unavailable - mail system is down
Oct 24 18:18:18 csaba-laptop postfix/postqueue[1125]: warning: Mail system is down -- accessing queue directly