Spoofing on secderrhttps://secderr.tech/tags/spoofing/Recent content in Spoofing on secderrsecderrhttps://secderr.tech/images/og-default.pnghttps://secderr.tech/images/og-default.pngHugoen-usSun, 11 Oct 2026 00:00:00 +0000Shutting Down Direct Send in Microsoft 365 (Without Breaking Your Printers)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.