Update 12/19/2025: Updated GCC dates.
As with all cloud services, Exchange Online imposes service limits to prevent misuse of Exchange Online resources and ensure availability for all users. For ex...
Updated Dec 19, 2025
Version 22.0
Blog Post
If your tenant gets outbound email blocked due to TERRL is there a pathway to get the block lifted through Microsoft Support?
We experienced this first hand when an admin error meant our M365 E5 subscription was momentarily disabled. This meant that TERRL saw no licensed Exchange users in the organisation, dropped our rate limit down to 100 emails per day, and our outbound email was blocked soon after. We immediately added licenses to the tenant but the block remained for approx 8 hours. Microsoft support advised they were not able to help and we would just have to wait up to 24 hours. We're an IT Managed Service Provider and 8 hours was a very long time for our outbound email (including customer facing Service Desk) to be offline.
It seemed like a huge disruption for a small mistake and I was very surprised there was no ability for Microsoft support to manually lift the block. Now we're worried about the same thing happening to our customers and what we can do if it happens again.