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How to Configure Custom Safe Links Policies in Microsoft Defender for Office 365

Safe Links is a feature in Microsoft Defender for Office 365 (formerly known as Office 365 Advanced Threat Protection or ATP) that helps protect your organization from malicious hyperlinks in email messages. When an email contains a hyperlink, Safe Links checks the URL against a list of known malicious links. If the link is safe, the user can access the website normally. However, if the link is malicious, Safe Links blocks access to the website and alerts the user and administrators.

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Microsoft Defender for Office 365-Find the Domain Name of the Trusted ARC Sealers from the Message Header

An email message internet header is a metadata set containing information about the sender, recipient, routing, and delivery of an email. It can help you find the domain name of the trusted ARC sealers. The domain name must match the domain specified in the d value of the ARC-Seal and ARC-Message-Signature headers in affected messages.

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Microsoft Defender for Office 365-Configure trusted ARC sealers email authentication for Microsoft 365 Custom domains

Authenticated Received Chain (ARC) is a mechanism used in email authentication protocols to address the issues of message forwarding and intermediary handling of emails. It is designed to improve the reliability and security of email authentication systems like SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail).

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