Receiving limits on AWS WorkMail

Hi,

We have specific need where we receive a large number of emails regulary. We receive up to 500 emails per minute from a single email adress. I read in the faq https://aws.amazon.com/workmail/faqs/ that there are no receiving limits with Aws WorkMail, however your messages can be queued or even rejected if large volume of emails are received in a short period of time.

Is there anyway to find out how many emails (per minute/per hour) actualy constitutes a large volume of incoming email in a short period of time?

Is there a way to insure that receiving emails are not rejected in any way at least from a single sender?

Thank you