Email tracker blocker for Office 365
Office 365 webmail can render remote tracking pixels. After you opt into outlook.office.com, Mailshade uses Chrome's declarativeNetRequest to cancel browser requests that match its reviewed tracker-pixel endpoint catalog. A local DOM scan detects pixels and supported tracking-link patterns; recognized links offer a direct-or-original choice. Detected occurrences are recorded in a local per-sender dashboard. This page describes that Office 365 web scope alongside the separate consumer Outlook integration.
Office 365 and tracking
The Office 365 web client can render remote images, including tracking pixels.
What Mailshade does in Office 365
- After opt-in, cancels browser requests matching reviewed tracker-pixel endpoints via DNR on outlook.office.com.
- Detects supported tracking-link patterns locally and lets you choose direct or original.
- Shows a red-eye overlay naming the detected tracker endpoint.
- Records detected tracker occurrences in a per-sender IndexedDB dashboard.
Consumer Outlook too
Mailshade also offers separate opt-in coverage for consumer Outlook at outlook.live.com.
Local-first history
Core inbox history stays in local IndexedDB with tracker URLs reduced to origins; it is not transmitted to Mailshade servers. Settings can use Chrome Sync, paid actions contact Mailshade auth/Polar, and optional privacy-filtered Hawk crash reports are off by default.
FAQ
Does Office 365 block tracking pixels on its own?
Office 365 can load remote images including tracker pixels. Mailshade uses declarativeNetRequest to cancel opted-in browser requests that match its reviewed tracker-pixel endpoint catalog.
Does Mailshade cover both Office 365 and consumer Outlook?
Yes. After separate opt-in, it runs on outlook.office.com and outlook.live.com and evaluates browser requests against the same reviewed tracker-pixel endpoint catalog.
Is my Office 365 mail data sent anywhere?
Core inbox history stays in local IndexedDB and is not sent to Mailshade servers. Settings can use Chrome Sync; paid actions contact Mailshade auth/Polar, and optional privacy-filtered Hawk crash reports are off by default.
Does it work in the Outlook desktop client used with Office 365?
No. Mailshade is a Chrome MV3 extension for the Office 365 web client at outlook.office.com. The native desktop Outlook does not support browser extensions.
How much does the Office 365 tracker blocker cost?
Core protection remains free after a 14-day Pro trial. Paid Pro starts at $3.99 per month or $19 one-time for Founders Lifetime.