How To Fix a “Corrupted index cache file” Error in Dovecot

Author: erics, Posted June 17th, 2016 at 12:19:00pm

Jun 17 00:02:45 inbound dovecot: IMAP(yourName): Corrupted index cache file /home/yourName/Maildir/dovecot.index.cache: invalid record size

service dovecot stop
cd /home/yourName/Maildir/
rm dovecot.index*
service dovecot start

service dovecot stop

cd /home/yourName/Maildir/

rm dovecot.index*

service dovecot start

As always, YMMV. Proceed with caution.

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