Simple alert for number of emails sent above/below a threshold

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I would find it extremely helpful to have an "as needed" alert for when the number of emails sent in a day (or other time period) is above or below a certain number.

This would have a number of uses. Particularly, it would help catch the case where something goes wrong and too few emails were sent (or none), or too many emails were sent (ping-pongs etc.), and could help us notice in a timely fashion when anomalous numbers of emails are sent from our account.