Microsoft has canceled indefinitely its previously planned daily limit on the number of external recipients Exchange Online users can send bulk emails to. This draws back a change that was intended to restrict users to 2,000 external recipients per mailbox per day, a policy originally announced in 2024.

Why it was canceled

The cancellation comes after significant negative feedback from enterprise customers, who warned the limit would disrupt legitimate business workflows — for example, marketing, notifications, and automated system emails. Microsoft acknowledged these concerns and decided not to enforce the limit as planned. T

What’s still in place

Although this specific external-recipient daily limit is being shelved:

• Existing Exchange Online rate limits remain active. For instance, standard limits like the Recipient Rate Limit (e.g., 10,000 recipients per day) and Tenant-level External Recipient Rate Limit (e.g., 5,000 external recipients per day) are still enforced according to Microsoft’s service descriptions.

Why it matters for organizations

• No immediate change to how you send bulk email: If your organization relies on Exchange Online for distributing high-volume legitimate communications (internal alerts, newsletters, system notifications), you won’t have to restructure your workflows or shift to third-party services yet.
• Security goals unchanged: Microsoft still aims to combat spam, abuse, and other unwanted email activities — but plans to adopt more adaptive, behavior-based mechanisms (e.g., anomaly detection or smarter abuse prevention) rather than a strict per-day cap.

What to expect next

Microsoft plans to explore less disruptive solutions to protect Exchange Online from spam and abusive bulk sending. Administrators are advised to stay tuned for updates and best practices as these new approaches are rolled out.