https://secderr.tech/tags/exchange-online/Recent content in Exchange Online on secderrhttps://secderr.tech/images/og-default.pnghttps://secderr.tech/images/og-default.pngHugoen-usSun, 11 Oct 2026 00:00:00 +0000https://secderr.tech/posts/zap-quarantine-mass-release/Sat, 10 Oct 2026 00:00:00 +0000https://secderr.tech/posts/zap-quarantine-mass-release/A URL reputation hit turned ZAP against a client's own mail. How we proved it, beat the quarantine expiry clock, and released 1,600 messages safely.https://secderr.tech/posts/aitm-vendor-phish-microsoft-365/Thu, 08 Oct 2026 00:00:00 +0000https://secderr.tech/posts/aitm-vendor-phish-microsoft-365/A trusted vendor's share link led to AiTM token theft and a phishing run from our user's mailbox. How we scoped it, cleaned it up and what stops it.https://secderr.tech/posts/blocking-direct-send/Tue, 06 Oct 2026 00:00:00 +0000https://secderr.tech/posts/blocking-direct-send/Block unauthenticated Direct Send spoofing in M365 without breaking legacy apps and printers. Find your legitimate senders, create inbound connectors, and flip RejectDirectSend.