1) If a throttle limit is reach then how is one notified ?
3) What happens to emails that exceed the throttle limit - are these queued or discarded ?
Email will be rejected immediately.
2) Where can we check behind the scenes (eg: logs) when and for who throttling has occurred?
iRedAPD will log this to log file /var/log/iredapd/iredapd.log.
How do you expect to know these? in iRedAdmin-Pro? Or email notification?