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
Announcing New DMARC Policy Handling Defaults for Enhanced Email Security
Domain-based Message Authentication, Reporting & Conformance (DMARC) is a standard that helps prevent spoofing by verifying the sender’s identity. If an email fails DMARC validation, it often means that the sender is not who they claim to be, and the email could be fraudulent. The ‘p=’ value (this stands for “policy”) in a DMARC TXT DNS record represents the sender’s policy for their domain. It te
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セキュリティ アドバイザリ 2862973 ～ ルート証明書プログラムにおける MD5ハッシュの利用制限 - 日本のセキュリティチーム - Site Home - TechNet Blogs