Exim Error:Retry time not reached

While sending mails, you may get the following error in the logs
T=remote_smtp defer (-53): retry time not reached for any host

This can be caused by corrupted exim databases.

Solution:
/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/courierup -- force
/scripts/eximup --force