Is mail.com MailCheck safe?
mail.com MailCheck scans open tab URLs at install to capture affiliate codes and sends account and install data to go.mail.com on uninstall.
At first install, the extension queries all open browser tabs and scans their URLs for hash-fragment-encoded affiliate keys, storing any match locally. When the extension is removed, it fires a beacon to go.mail.com containing the captured affiliate code, account count, login state, and install date. Additionally, a content script running on mail.com and related vendor pages injects a postMessage listener that replies to any page—without origin restriction—with extension metadata including version, install date, and affiliate key.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
Who publishes it1&1 Mail & Media - 1 other listing from the same operator, none carrying a finding
1&1 Mail & Media - 1 other listing from the same operator, none carrying a finding
What this publisher told the store about itself, and the other listings that told it the same thing.
Same store account
1 other listing published from this account, 100k+ users between them, none of them carrying a finding.
Shared hosts - 27 hostnames
Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.
AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.
Publishers can request a review.
What it can do
Permissions this extension asks for, as declared in version 8.0.5.0. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.
Read and change your data on mail.com
https://*.mail.com/*
Read and change your data on web.de
https://*.web.de/*
Read and change your data on 1und1.de
https://*.1und1.de/*
Read and change your data on uilogin.de
https://*.uilogin.de/*
Read and change your data on gmx.com
https://*.gmx.com/*
Read and change your data on accounts.google.com
https://accounts.google.com/*
Read and change your data on www.googleapis.com
https://www.googleapis.com/*
Read and change your data on mail.google.com
https://mail.google.com/*
Read and change your data on live.com
https://*.live.com/*
Read and change your data on localhost
*://localhost/*
Act on the current tab, but only after you click the extension
activeTab
Schedule its own background tasks
alarms
See the address and title of every tab you have open
tabs
Run its own code inside the pages you visit
scripting
Store data in your browser
storage
Show you desktop notifications
notifications
Run hidden pages in the background
offscreen
Add items to the right-click menu
contextMenus
Sign you in with your Google account
identity
Where it sends data
Destinations our analysis observed MailCheck contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.
- go.mail.com
MailCheck sends data to go.mail.com. No other extension we have analyzed sends data here.