There is a option in WHM Tweak Settings for "Max hour emails per domain". That is about as close as you are going to get with base cpane/WHM.
Hourly limits are the standard: How to Set Email Send Limits | cPanel & WHM Documentation
There is a feature request for additional limits though here: https://features.cpanel.net/topic/additional-email-limits-per-domain-per-day-max-in-queue
There is a feature request for additional limits though here: https://features.cpanel.net/topic/additional-email-limits-per-domain-per-day-max-in-queue
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