Email tracker blocker for Outlook
Mailshade covers consumer Outlook and Office 365 as separate opt-in web clients. On outlook.live.com and outlook.office.com, Chrome's declarativeNetRequest cancels 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. The local IndexedDB dashboard records detected tracker occurrences by sender. This page explains the scoped browser behavior and local reporting available on Outlook web.
Why Outlook needs deliberate coverage
Outlook web uses separate origins and markup, so client-specific UI and reproducible testing matter.
What Mailshade does in Outlook
- After opt-in, cancels browser requests that match reviewed tracker-pixel endpoints via declarativeNetRequest.
- Covers both outlook.live.com and the Outlook on Microsoft 365 web origins.
- Detects supported tracking-link patterns locally and lets you choose direct or original.
- Records detected tracker occurrences to a per-sender dashboard.
Consumer Outlook and Microsoft 365
The same reviewed DNR catalog is scoped to each granted Outlook origin, while separate adapter tests verify the page integration.
Evidence and limits
Product scope is documented here; comparative blocking and precision results require the shared dated browser benchmark. Mailshade source code is published under AGPL-3.0-or-later.
FAQ
How is Mailshade's Outlook coverage scoped?
Consumer Outlook and Microsoft 365 are separately granted web origins with a dedicated adapter and local sender-level history. Comparative behavior is reported only by the shared dated benchmark.
Does this cover Outlook.com and Office 365 both?
Yes. After separate opt-in, Mailshade runs on outlook.live.com and outlook.office.com with the same reviewed tracker-endpoint catalog.
Does it work in the Outlook desktop app?
No. Mailshade is a Chrome MV3 extension for the Outlook web client. It does not run in the native desktop application, which has no browser-extension support.
Will it stop legitimate Outlook images and signatures loading?
Mailshade cancels requests that match reviewed tracker-pixel endpoints rather than disabling all images; non-matching image requests can continue to load.
How much does the Outlook 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. Mailshade source code is published under AGPL-3.0-or-later at mailshade.org/source/.