hello dovecot -n # 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-12-amd64 x86_64 Debian 10.0 what is the meaning / cause of this in mail.err:- ---------------------------------------------------------- dovecot: imap(david)<5004><vCVKAtO2UI1/AAAB>: Error: Mailbox Trash: open() failed with mbox: Required key not available ---------------------------------------------------------- I can telnet to port 143, log in and list folders, but cannot open them. This seems to have resulted from an experimental install (now purged) of courier-imap (I maintain a webmail program). Before this, dovecot just worked; now this problem remains even after a reinstall. -- David Matthews mail at dmatthews.org