Allow me to configure my own sender limits.

Zendesk only allows a given email to send 20 emails in an hour, then suspends the next 20, then throws out any further emails from that sender in the hour without any kind of notification or ability to retrieve them. Adding the email to your customer allow list ups this limit, but even that is not enough frequently, and you have to have added the email before the email deluge starts. I would like to be able to configure these limits for my instance myself, as these are extremely impractical given the volume and kind of business in 2021.

For one example, plenty of suppliers have automations in place now a days to instantly contact you if you or your customers place a request for an out of stock item, bad address, etc.
This can end up generating a lot of very important and still wanted and needed emails from a single address in a short period. If they add a team member and these start generating from a new email address from their domain, you are gonna lose everything after 40 tickets. Right now, the only option to recover them is to actually log into the email they were sent to and manually copy and paste them into new manual tickets. Not a fun time!

Being able to configure the limits for any end user as well as explicitly allowed users, would give me the flexibility to prevent mass spamming, while still being able to received a boatload of emails all at once without some of them getting thrown away without notice.