I frequently hit the Subscriber Limit, at what point MailPoet stops sending out emails.
Then I either clean up the "Unconfirmed" list or upgrade the plan, when I'm really getting close to the next tier.
However, I do not see that notification myself, as most of my email campaigns are automated sequences.
→ I'd like to receive two email notifications from MailPoet. The first, when the quota is getting tight (e.g. 97% used), and once when sending stops completely.