"Customers have shared that this limit creates significant operational challenges, especially given the limited capabilities of bulk sending offerings available today. Your feedback matters, and we're committed to solutions that balance security and usability without causing unnecessary disruption."
"We plan to address these issues in ways that are less disruptive to your business workflows,"
"This means smarter, more adaptive approaches that protect the service while respecting your operational needs."
"help reduce unfair usage and abuse of Exchange Online resources."
Microsoft abandoned a planned external recipient rate (ERR) limit of 2,000 recipients per 24 hours for Exchange Online after customers reported significant operational challenges. The proposed rule would have applied per user/mailbox as a sub-limit beneath the existing 10,000 recipient rate and targeted new tenants in 2025 with phased rollout for existing tenants later that year. Microsoft delayed the timeline into 2026 while customers adapted, then scrapped the plan as some integrations and legitimate high-volume uses would fail under the restriction. Microsoft intends to develop smarter, more adaptive measures to curb outbound abuse without disrupting business workflows.
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