Sometimes you may face this error message from the exim_mainlog:
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2018-01-30 23:17:40 1egXfI-003MAg-GI ** bstrickland_14111@hotmail.com R=enforce_mail_permissions: Domain rakyatholdings.com.my has exceeded the max defers and failures per hour (92/50 (50%)) allowed. Message discarded.
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This means that the domain rakyatholdings.com.my has attempted and failed to send emails 92/50 times.
This could be because the recipient’s email addresses doesn’t exist.
To clear this max defers and failures per hour:
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cd /var/cpanel/email_send_limits
drwxr-x— 2 root mail 16384 Jan 31 17:27 cache
-rw-r–r– 1 root root 125 Jan 19 12:01 defer_cutoff
drwxr-x— 2 root root 6 Jan 31 15:00 hourly_notify
drwxr-x— 133 root mail 8192 Jan 31 18:00 track
rm -f defer_cutoff
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Sometimes you may find a similar file name to “defer_cutoff” which includes the particular username.
Remove this particular file to reset the max defers and failures per hour.