Notification When Inbound Emails Stuck in Queue?

Hello,

We currently have our instance setup with inbound actions to automatically convert inbound emails to their respective applications, thus creating a ticket. Following recent issues, we realised that on occasion these emails were not processing and were being held in the ServiceNow inbox, but the only means of alerting was when users complained. 

Would it be possible to create a notification that would alert certain users if, for example, more than 15 emails are stuck in the inbox in the state 'ready' or if we wanted to trigger based off of a timescale i.e. emails received are not processed within 15 minutes? 

Thanks,