Microsoft has announced that it is canceling its planned daily limit of 2,000 external recipients for Exchange Online bulk email senders — a restriction originally introduced to combat spam and unfair usage.
The limit, announced in April 2024, was scheduled to roll out between July and December 2025. However, after significant customer feedback, Microsoft decided to halt enforcement indefinitely.
“Customers have shared that this limit creates significant operational challenges… Your feedback matters, and we're committed to solutions that balance security and usability without causing unnecessary disruption,” the Exchange Team stated.
What’s changing — and what’s not
❌ Cancelled:
- Daily 2,000 external recipient limit per mailbox
✅ Still enforced:
- Recipient Rate Limit: 10,000 recipients
- Tenant External Recipient Rate Limit: 5,000 external recipients per day
Microsoft emphasized that future protections will rely on smarter, adaptive anti-abuse mechanisms, rather than hard limits that disrupt legitimate business workflows.
Industry-wide trend
Google is also tightening email security:
- Bulk senders must authenticate with SPF, DKIM, and DMARC
- Unauthenticated or high-spam senders are automatically blocked
- One-click unsubscribe and fast opt-out handling are mandatory
Together, these changes signal a broader shift toward email hygiene, authentication, and reputation-based controls, rather than blunt rate limiting.
📌 Takeaway:
Bulk emailing is still possible — but poor authentication and bad sending practices are no longer tolerated.
