We're using a mailbox to store transactional / notification type messaging. Specifically when our product has an unhandled exception it sends an email to this particular mailbox.
This product currently has about 300 installations, so the occasional exception is fairly normal and therefore we don't need to monitor that mailbox all the time.
However, if we introduce a bug in the product, then the number of exceptions will sky-rocket and flood the mailbox with issues.
In the meantime we've got a "user" alert to let us know if the mailbox has more than 1% storage in it but under normal scenarios we'll get that notification every so often.
We're proposing a new event if possible, that can be similar to a throttling event for outgoing message but instead measure incoming messages to a single mailbox and trigger an alert when that happens. For example, set the conditions that when X messages are received within X minutes, then trigger the alert.
Thanks for the consideration.