Hi All,

In mail.log exists an error messages "Error: Corrupted index cache file /data/mail/vhosts/domain.com/user@domain.com/Maildir/dovecot.index.cache: invalid record size" for some accounts.

I tried these steps to fix it:

1. Running commands

doveadm -D -v index -u user@domain.com INBOX

# doveadm -v force-resync -u user@domain.com INBOX

after this I saw that the following files are updated in ../Maildir/: dovecot.index.cache dovecot.index.log dovecot-uidlist

But after some time error messages occurred again.

2. Added NFS mount option 'nordirplus' to /etc/fstab with remount /data partition, add 'mmap_disable = yes' and 'mail_fsync = always' to 10-mail.conf as advised on https://doc.dovecot.org/configuration_manual/nfs/ (because /data partition mounted via NFS);

3. Renaming 3 files with/without Dovecot service pre-stop.

mv dovecot.index old.dovecot.index

# mv dovecot.index.cache old.dovecot.index.cache # mv dovecot.index.log old.dovecot.index.log

Unfortunately, all done steps didn't fix issue. What is the proper way to fix corrupted index cache errors?

dovecot package: 1:2.2.33.2-1ubuntu4.8 (Ubuntu-18.04).

p.s. for some of email accounts also exists error messages "Error: Broken file ../Maildir/dovecot-uidlist line ###: Invalid data:" besides mentioned cache error.

-- Best wishes Sohin Vyacheslav