451-X.X.X.X is not yet authorized to deliver mail from 451>. Please try 451 later.

 


You may just need to clear the Exim retry database. You can do that by running these commands:

Code:
/usr/sbin/exim_tidydb -t 0d /var/spool/exim retry > /dev/null
/usr/sbin/exim_tidydb -t 0d /var/spool/exim reject > /dev/null
/usr/sbin/exim_tidydb -t 0d /var/spool/exim wait-remote_smtp > /dev/null

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