Email tracker blocker for Outlook
Outlook users are often left out because many tracker blockers were built for Gmail. Mailshade covers consumer Outlook and Office 365 as separate opt-in clients. On outlook.live.com and outlook.office.com, Chrome's declarativeNetRequest cancels requests to known tracker-pixel domains before they load. 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 how known-domain blocking works in Outlook and why coverage there is uncommon.
Why Outlook is usually uncovered
The tracker-blocker market is Gmail-centric, so most extensions only inject into mail.google.com. Outlook web uses its own domains and markup, so blocking there requires deliberate support — which Mailshade builds in.
What Mailshade does in Outlook
- After opt-in, cancels requests to known tracker-pixel domains via declarativeNetRequest.
- Covers both outlook.live.com and outlook.office.com.
- Detects supported tracking-link patterns locally and lets you choose direct or original.
- Records detected tracker occurrences in a per-sender dashboard.
Consumer Outlook and Office 365
The blocking mechanism is identical on both surfaces: DNR rules cancel requests to known tracker-pixel domains.
How it compares
Trocker covers Outlook partially with only a blocked count; the Gmail-only tools do not cover it at all. Mailshade offers both web surfaces, open AGPL-3.0 source, and per-sender detection history.
FAQ
Do other tracker blockers work in Outlook?
Most do not — they are Gmail-only. Trocker covers Outlook partially with a count. Mailshade adds known-domain network blocking and local detection history.
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 known-domain DNR blocking.
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 blocks known tracker domains rather than disabling all images, so images from other domains 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. The source is open under AGPL-3.0 at mailshade.org/source/.