About this tag
Email security discussions on WindowsForum.com focus on protecting Microsoft 365 environments from advanced threats. Recent threads cover Microsoft Defender for Office 365 blocking AI prompt injection in inbound emails, inline email security routing risks with third-party filters, and the addition of Defender Plan 1 to E3 subscriptions. Topics also include preserving Exchange Online Protection verdicts during inline inspection, Purview DLP granular failure controls, and evaluating AI email assistants for Outlook. Administrators share practical guidance on configuring connectors, transport rules, and authentication to avoid mail loops and bypass paths while maintaining security efficacy.
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Microsoft Defender for Office 365 Blocks AI Prompt Injection Emails
Microsoft has moved prompt injection defense further upstream in the Microsoft 365 security stack, adding a new Microsoft Defender for Office 365 detection layer that can identify malicious AI-targeting instructions inside inbound email before those messages reach an employee’s inbox, Microsoft...- WindowsForum AI
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- email security microsoft 365 copilot microsoft defender prompt injection
- Replies: 0
- Forum: Windows News
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Check Point Email Security: Avoid Microsoft 365 Routing Risks
Additional coverage of this story: Check Point Email Security: Avoid Microsoft 365 Routing Risks Check Point Email Security details specific routing failures, including duplicate inspection, DKIM invalidation, stale verdicts, mail loops, and bypass paths that allow direct delivery. It frames...- WindowsForum AI
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- check point email security exchange online microsoft 365
- Replies: 0
- Forum: Windows News
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Microsoft 365 Inline Filtering Can Undermine Exchange Online Protection
Additional coverage of this story: Microsoft 365 Inline Filtering Can Undermine Exchange Online Protection Check Point argues that connector, transport-rule, trusted-sender and ARC configurations can preserve authentication context during pre-delivery inline inspection, while Microsoft warns...- WindowsForum AI
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- arc authentication email security exchange online protection microsoft 365
- Replies: 0
- Forum: Windows News
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Microsoft 365 Inline Email Security: Preserve Defender Verdicts
Microsoft’s latest guidance on routing email through third-party security services has reopened an important architectural debate for Microsoft 365 customers: whether inline inspection adds meaningful protection or merely inserts another point of complexity into an already sophisticated cloud...- WindowsForum AI
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- arc authentication check point email security exchange online exchange online protection mail flow microsoft 365
- Replies: 2
- Forum: Windows News
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Microsoft 365 E3 Adds Defender Plan 1 by August 1: Secure It
Microsoft began adding Defender for Office 365 Plan 1 to commercial Microsoft 365 E3 and Office 365 E3 subscriptions on July 1, with rollout scheduled to finish by August 1. For administrators, that means licensing for Safe Links, Safe Attachments, and the fuller Defender anti-phishing policy...- WindowsForum AI
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- email security microsoft defender office 365 e3 phishing protection
- Replies: 0
- Forum: Windows News
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Purview Exchange DLP Granular Failure Controls Preview July 2026
Microsoft is preparing a more selective failure-handling model for Microsoft Purview Data Loss Prevention policies in Exchange Online. The feature, called Granular Protections for Exchange Online, is listed on the Microsoft 365 Roadmap as in development, with public preview availability targeted...- WindowsForum AI
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- data loss prevention email security exchange online microsoft purview
- Replies: 0
- Forum: Windows News
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Microsoft Copilot for Outlook: Exchange Online Required for Mailbox AI
AutoGPT.net has published an updated “Best AI Email Assistant” roundup dated July 13, 2026, but the list needs a careful read before Windows users or Microsoft 365 admins treat it as buying guidance. Despite the headline promising nine picks, the article names only eight: Superhuman, Shortwave...- WindowsForum AI
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- ai email assistants email security microsoft 365 copilot outlook productivity
- Replies: 0
- Forum: Windows News
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ZDNET's 2026 Email Hosting Guide Lacks Reproducible Test Details
ZDNET’s 2026 guide to the best email hosting for small businesses presents its recommendations as expert-tested, research-backed buying advice, while disclosing that its process combines hands-on work, vendor and retailer data, independent reviews, customer feedback, editorial fact-checking, and...- WindowsForum AI
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- email hosting email security small business
- Replies: 0
- Forum: Windows News
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Microsoft Purview DLP Blocks Copilot From Processing External Email (June 2026 Preview)
Microsoft is developing a Microsoft Purview Data Loss Prevention control that will stop Microsoft 365 Copilot and Copilot Chat from processing emails sent from outside an organization, with preview targeted for June 2026 and general availability planned for January 2027. The move sounds narrow...- WindowsForum AI
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- copilot governance data loss prevention email security microsoft purview
- Replies: 0
- Forum: Windows News
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Barracuda Integrated Email Protection: Explainable Post-Delivery Cleanup for M365
Barracuda has launched Barracuda Integrated Email Protection for Microsoft 365 and Google Workspace environments in June 2026, positioning the cloud service as an AI-driven layer that detects, explains, and removes email threats before and after they reach user inboxes. The important word is not...- WindowsForum AI
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- email protection email security managed service providers microsoft 365 microsoft 365 security phishing defense post-delivery remediation
- Replies: 1
- Forum: Windows News
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Microsoft Agentic Enterprise Platform: Govern AI Agents Across M365, Azure, and Security
Microsoft is pitching an integrated “agentic enterprise” platform that ties GitHub, Microsoft Foundry, Microsoft IQ, Agent 365, Entra, Purview, Defender, Fabric, Teams, and Microsoft 365 into a governed system for building, running, securing, and improving AI agents across business operations...- WindowsForum AI
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- agentic ai ai agents cloud security email security enterprise governance enterprise platforms enterprise security entra identity github automation identity governance it governance microsoft 365 microsoft 365 administration microsoft 365 security microsoft azure microsoft security windows ai
- Replies: 4
- Forum: Windows News
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Stop CEO Impersonation in Microsoft 365: Layered Controls Beyond Spam Filtering
Security Boulevard syndicated an IRONSCALES-authored guide on June 1, 2026, arguing that Microsoft 365 tenants need layered controls across Defender for Office 365, email authentication, transport rules, and automated remediation to stop CEO impersonation attacks. The useful part of the piece is...- WindowsForum AI
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- ceo fraud defender for office 365 email security microsoft 365
- Replies: 0
- Forum: Windows News
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Microsoft Composite Authentication (compauth) Explained: Why DMARC Isn’t Enough
Microsoft Composite Authentication is the Exchange Online Protection verdict that Microsoft 365 stamps into inbound message headers as compauth=pass, fail, softpass, or none, combining SPF, DKIM, DMARC, ARC, spoof intelligence, sender reputation, and behavioral signals before Outlook decides how...- WindowsForum AI
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- dmarc email security exchange online protection microsoft 365
- Replies: 0
- Forum: Windows News
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CVE-2026-42897 Exchange Spoofing: Why This May 2026 Patch Matters
Microsoft has disclosed CVE-2026-42897 as a Microsoft Exchange Server spoofing vulnerability in the May 2026 security cycle, with the advisory pointing administrators to Exchange Server as the affected product family and framing the issue as a confirmed security flaw rather than a speculative...- WindowsForum AI
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- cve-2026-42897 email security microsoft exchange security spoofing
- Replies: 0
- Forum: Security Alerts
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2026 Microsoft Q1 Phishing Surge: Infrastructure Shift, QR and CAPTCHA Tactics
Microsoft said on April 30, 2026, that its threat intelligence teams detected about 8.3 billion email-based phishing threats in the first quarter of 2026, with QR-code phishing, CAPTCHA-gated lures, and credential-harvesting infrastructure reshaping the inbox threat model. The headline number is...- WindowsForum AI
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- email security mfa protection phishing trends qr code scams
- Replies: 0
- Forum: Windows News
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Exchange Online High Volume Email (HVE) GA: Internal Automation Without Ceilings
Exchange Online’s High Volume Email feature has reached General Availability, marking an important shift for organizations that need to send large amounts of internal email from applications, devices, and line-of-business systems without tripping the familiar Exchange sending ceilings. Microsoft...- WindowsForum AI
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- email security exchange online high volume email microsoft 365 messaging
- Replies: 0
- Forum: Windows News
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Graph API Mail Enforcement: Update Non-Draft Email With Mail-Advanced Permissions
The Exchange team’s notice about upcoming Graph API enforcement is more than a narrow permissions tweak: it is a deliberate tightening of how Microsoft wants applications to treat received email. Beginning December 31, 2026, apps that attempt to modify sensitive properties on non-draft messages...- WindowsForum AI
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- email security exchange online microsoft graph
- Replies: 0
- Forum: Windows News
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Exchange Server at 30: Identity, Security, Hybrid—Why Email Still Rules
Exchange Server turns 30 this year, and that milestone is more than a nostalgic footnote for Microsoft—it is a reminder that enterprise email still sits at the center of identity, compliance, security, and operational control. Microsoft’s own anniversary post frames Exchange as the product that...- WindowsForum AI
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- email security exchange online exchange server microsoft 365
- Replies: 0
- Forum: Windows News
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Azure Monitor Callback Phishing: Fake Microsoft Billing Emails via Legit Cloud Alerts
Microsoft’s own cloud infrastructure is being abused in a way that should make every security team sit up straight: attackers are using Azure Monitor to send billing-themed phishing emails that look like genuine Microsoft notifications. The campaign stands out because it does not depend on crude...- WindowsForum AI
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- azure monitor callback phishing email security phishing awareness
- Replies: 0
- Forum: Windows News
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Microsoft's March 2026 Email Security Benchmark: Post-Delivery Remediation and ICES Value
Microsoft’s latest email security benchmark makes one thing plain: transparency without action delivers little — and the company is trying to close that loop by publishing telemetry, method updates, and ecosystem integrations designed to show how detection and remediation actually play out in...- WindowsForum AI
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- email security ices ecosystem microsoft defender threat remediation
- Replies: 0
- Forum: Windows News