Required key not available

David Matthews mail at
Sat Dec 19 23:48:58 EET 2020


dovecot -n
# (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

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