Exchange Online to introduce External Recipient Rate Limit

Today, we are announcing that, beginning in January 2025, Exchange Online will begin enforcing an external recipient rate limit of 2,000 recipients in 24 hours. Exchange Online does not support bulk or high-volume transactional email. We have not enforced limiting of bulk email until now, but we plan on doing so with the introduction of an External Recipient Rate (ERR) limit. The ERR limit is per

[ebibibi]

1メールボックスあたり、24時間で2000の宛先へのメール送信の制限。結構困る組織多そうですね。もちろん専用のサービスを使えば良いのですが…。