This video walks through using the Microsoft Delisting Service to remove a mail server IP from Microsoft’s blocked-senders list when messages to Microsoft 365 users fail with an NDR like “Access denied. Banned sending IP.” It explains why an IP gets blocked (signals like high volumes of phishing/spam implying compromise or abuse), and strongly recommends checking the server for indicators of compromise and reviewing other deny lists before requesting delisting—otherwise you’ll boomerang right back onto the block list. The demo then shows the exact steps: open sender.office.com, enter the email address that received the error and the blocked IP, complete the captcha, confirm via the email you receive, and select Delist IP address—allowing up to 24 hours for changes to propagate across Microsoft’s infrastructure.
We produced this as a step-by-step “get unblocked safely” walkthrough—focused on the decision point that matters (verify you’re not compromised) and the few fields that must be correct for delisting to work. The video pacing is tuned for follow-along, with clean callouts around confirmation and expected propagation time, and final delivery includes closed captions, audio description, and thumbnails.
The inevitable sequels
Hollywood keeps stretching good ideas into progressively worse sequels. We don’t. These are the related videos—spiritual siblings of the one you just watched—as good or better than this video. Expect callbacks, new plot twists, and maybe even a scene-stealing cameo from a lower third.
