adaptive protections

Microsoft quietly backed away from a planned per‑mailbox external recipient cap for Exchange Online after sustained customer pushback, saying the proposed Mailbox External Recipient Rate Limit (often described as a 2,000‑external‑recipients per mailbox in a 24‑hour sliding window policy) will...

Microsoft has quietly abandoned the planned per‑mailbox Mailbox External Recipient Rate Limit (commonly discussed as the 2,000‑recipient ERR/MERRL cap) after customers warned the rule would break legitimate workflows and integrations, and the Exchange team says it will pursue smarter, more...