If you find the following error in your EXIM logs, it means that your EXIM databases could be corrupted.
defer (-53): retry time not reached for any hostThe fix is to rebuild exim databases. To rebuild exim databases you can run the following commands as root:
/usr/sbin/exim_tidydb -t 1d /var/spool/exim retry > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim reject > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim wait-remote_smtp > /dev/null
/scripts/eximup --force
