check before: 2021-07-14
Defender, Exchange, Microsoft Defender for Office 365, Outlook
Online, World tenant
Admin impact, Feature update, Updated message
Updated July 02, 2021: We have updated the rollout timeline below. Thank you for your patience.Microsoft believes it?s critical to keep our customers secure by default. We have determined that legacy overrides tend to be too broad and cause more harm than good. As a security service, we believe it's imperative that we act on your behalf to prevent your users from being compromised. This means these legacy overrides will no longer be honored for email messages we believe are malicious. We already apply this approach with malware messages and now we have extended it to messages with high confidence phish verdicts. We have been taking a very deliberate approach to rolling out these changes in phases to ensure customers are not surprised and there are no negative side effects. We began to rollout Secure by Default for high confidence phishing messages by the override type starting in December 2020 (https://www.microsoft.com/microsoft-365/roadmap?filters=searchterms=60827 Roadmap ID 60827). Today, we?re at a point in our Secure by Default journey where the following overrides are not honored for malicious emails (malware or high confidence phish emails): Allowed sender lists or allowed domain lists (anti-spam policies)Outlook Safe SendersIP Allow List (connection filtering) We are now extending Secure by Default to cover high confidence phishing messages for the remaining legacy override type, Exchange mail flow rules (also known as transport rule or ETRs). [Key Points] Timing: We will begin rolling out Secure by Default for ETRs starting at the end of August (previously early August) and complete rollout by end of September (previously early September).Action: Review and assess impact.
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