There are always instances on the cPanel server where some clients want to temporarily increase disk quota when they exceeded it but few days later issue remain as it is.
In such cases, how to resend notification to user whose disk quota has exceeded on cPanel server?
Make sure following settings are enabled through WHM > Tweak Settings > Notification page :-
1) System disk space usage warnings.
2) Account system disk usage “warn” percentage.

To manually regenerate notification run below command :-

/usr/local/cpanel/scripts/quotacheck

Note :- Notification data is stored in the following directory/file:

/var/cpanel/notifications/
/var/cpanel/quotawarned

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