Published by exdone
Posted on November 11, 2018
Error: Mailbox access error: Panic: file mail-index-sync-keywords.c: assertion failed
Cause
Corrupted Dovecot index file.
Resolution
Connect to the server using SSH.
Move the file /var/qmail/mailnames/example.com/john.doe/Maildir/dovecot.index:
# cd /var/qmail/mailnames/example.com/john.doe/Maildir/
# mv dovecot.index{,.back}