Email tracker blocker for Office 365

Office 365 webmail loads remote tracking pixels the same way any client does, so opening a marketing or sales email reports your open to the sender — and consumer-focused blockers rarely cover the enterprise Outlook surface. Mailshade does. It runs on outlook.office.com and uses Chrome's declarativeNetRequest to cancel known tracker requests at the network layer before they fire, so the open is never sent. It also unwraps click-tracking redirect links and records each blocked sender in a local per-sender dashboard. Because Office 365 inboxes carry a heavy volume of sales and vendor outreach, the per-sender reporting is especially useful for seeing who tracks you most. This page explains how blocking works in Office 365 webmail and why dedicated coverage there is uncommon, alongside the consumer Outlook client Mailshade also supports.