6/25/2025 Important update regarding the cloud hosted Mailbox External Recipient Rate Limit: In order to reduce the impact on customers, Microsoft has again decided to delay the rollout of the cloud ...
Updated Jun 25, 2025
Version 14.0
Blog Post
This certainly reinforces then need for my on-prem Exchange environment and puts an end to any further mailbox migrations - which are our highest volume email senders. It may even require that some mailboxes are moved back to on-prem to prevent communication disruptions with customers. I thought MS wanted all of the mailboxes in M365....
I second stukey's question about making a report available. With the exception of the Hot Recipient Report, every MS report that I've reviewed includes a minimum of 7 days of data. If the limit enforcement is for a 24 hour period, then there needs to be a report that aligns with the limit parameters - AND it must be made available WELL IN ADVANCE of any enforcement.