Email tracker blocker for Outlook
Outlook users are usually left out: nearly every tracker blocker was built for Gmail, so opening Outlook on the web leaves the 1x1 tracking pixel free to fire and report your open. Mailshade is one of the few blockers that covers Outlook as a first-class client. It runs on outlook.live.com for consumer Outlook and outlook.office.com for Office 365, and uses Chrome's declarativeNetRequest to cancel known tracker requests at the network layer before they load, so the sender gets no open signal. It also unwraps click-tracking redirect links and records each blocked sender in a local per-sender dashboard backed by IndexedDB. Among rivals, only Trocker offers partial Outlook support and it has no reporting; Mailshade gives full Outlook coverage plus the dashboard. This page explains how blocking works in Outlook and why coverage there is so rare.
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
- Cancels known tracker requests via declarativeNetRequest before they fire.
- Covers both outlook.live.com and outlook.office.com.
- Unwraps click-tracking redirect links.
- Records blocked senders in a per-sender dashboard.
Consumer Outlook and Office 365
The blocking mechanism is identical on both surfaces; declarativeNetRequest rules cancel the tracker request regardless of which Outlook web client you use.
How it compares
Trocker covers Outlook partially with only a blocked count; the Gmail-only tools do not cover it at all. Mailshade offers full coverage, open AGPL-3.0 source, and per-sender reporting.
FAQ
Do other tracker blockers work in Outlook?
Most do not — they are Gmail-only. Trocker covers Outlook partially with just a blocked count. Mailshade treats Outlook web as a first-class client with full network-level blocking and reporting.
Does this cover Outlook.com and Office 365 both?
Yes. Mailshade runs on outlook.live.com for consumer Outlook and outlook.office.com for Office 365, using the same declarativeNetRequest blocking on both.
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?
No. Mailshade blocks only known tracker domains, so signatures, logos and newsletter images load normally. Only the covert tracking pixel is cancelled.
How much does the Outlook tracker blocker cost?
Pricing is the same for every client: from $3.99 per month or $19 one-time for Founders Lifetime. The source is open under AGPL-3.0 at github.com/mailshade/mailshade.