Chrome Web Store

17Versions

1Code reviewed

No malware found

In code review (v8.0.5.0)

Our reviewer read version 8.0.5.0 — the most recent version we have reviewed — and found no malicious behaviour. The version shown here has not been individually reviewed yet.

What our analysis found

GMX MailCheck, used by 100,000 people, showed no malicious code in Extension Auditor's review. Its permissions mean it can inject scripts into pages. It comes from a trusted publisher and was last updated in May 2024.

The extension is a legitimate mail checking tool for GMX and partner services, published by a trusted publisher (1&1 Mail & Media). All data flows to first-party domains (,, etc.) and the disclosed data collection categories (personally identifiable information, authentication information) match the extension's functionality. Permissions like scripting, identity, and offscreen are necessary for OAuth flows, notification sounds, and content script injection on authorized domains. No covert exfiltration, remote code loading, or obfuscation beyond standard minification was found. The ML model's low risk score (0.00) and the publisher's reputation contradict the third-party critical risk rating; the third-party score likely overweighs broad host permissions without considering the disclosed purpose.

GMX MailCheck Chrome extension security report

ID: camnampocfohlcgbajligmemmabnljcm

Supported Languages

🇺🇸English

🇫🇷French

🇩🇪German

🇪🇸Spanish

Extension Info & Metadata

Status

Active

Version

8.0.6

Size

2.20 MB

Rating

3.2/5

Reviews

434

Users

100,000

Type

Extension

Updated

May 27, 2024

Publisher Contextual Analysis

Trusted

Author: 1&1 Mail & Media
Privacy: Privacy Policy
Help: Help Center
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

230,332

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Screenshots & videos

Install growth

User Growth

Showing data from Jan 01, 2022 to Dec 31, 2022

Versions

No change in user count

Compared to 3 months ago

5 versions released in this period

Rating Count

Total: 351 ratings

Average Rating

Current: 3.30 / 5.0+0.01

See plans

React Flow

Internal permhash`aaa61059cb…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Permhash (Mandiant)`dc87452701…`
1 malicious

3 other extensions carry this fingerprint; 1 of the cluster are known malicious.

Withheldmalicious
Withheldnot flagged
Withheldnot flagged

Network indicators

110 URLs and 2 IP literals were extracted from this version.

Item	Type	Severity	Description
scripting	Permission	Critical	This permission allows injection and execution of JavaScript on any webpage. Rated Critical because it can modify page content, steal sensitive data, and inject malicious code into any site the extension has access to.
offscreen	Permission	High	This permission creates hidden browser documents with full DOM access. Rated High because it can run background operations invisibly, potentially executing malicious code without user awareness.
identity	Permission	High	This permission accesses Chrome identity service and user information. Rated High because it can obtain OAuth tokens, access connected accounts, and impersonate the user in authenticated service.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 20% increase: Access to sensitive domains increases potential impact• 10% increase: Early script execution enables pre-emptive content manipulation
activeTab	Permission	Medium	This permission grants temporary access to the current tab. Rated Medium because it can access current page content when invoked, though limited to user-initiated actions.
tabs	Permission	Medium	This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
storage	Permission	Medium	This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
https://.gmx.net/	Host	Medium	Host permission — access limited to this URL pattern.
https://.web.de/	Host	Medium	Host permission — access limited to this URL pattern.
https://.1und1.de/	Host	Medium	Host permission — access limited to this URL pattern.
https://.uilogin.de/	Host	Medium	Host permission — access limited to this URL pattern.
https://.mail.com/	Host	Medium	Host permission — access limited to this URL pattern.
https://accounts.google.com/*	Host	Medium	Host permission — access limited to this URL pattern.
https://www.googleapis.com/*	Host	Medium	Host permission — access limited to this URL pattern.
https://mail.google.com/*	Host	Medium	Host permission — access limited to this URL pattern.
https://.live.com/	Host	Medium	Host permission — access limited to this URL pattern.
://localhost/	Host	Medium	Host permission — access limited to this URL pattern.
Access to Sensitive Domains	Risk Factor	Medium	This extension requests access to sensitive domains: https://accounts.google.com/, https://www.googleapis.com/, https://mail.google.com/*
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
alarms	Permission	Low	This permission schedules periodic tasks. Rated Low because it can only trigger events at specified times without access to sensitive data.
notifications	Permission	Low	This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.
contextMenus	Permission	Low	This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.

Sensitive Domain Access

This extension has access to the following sensitive domains:

https://accounts.google.com/*
https://www.googleapis.com/*
https://mail.google.com/*

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About this extension

The safe way to access your personal mail.

Read the publisher’s full description

With the MailCheck extension, you only need to log in once with your GMX credentials in order to gain quick and simplified access. From then on, you merely click on the envelope icon in your browser for instant access to all of your emails (e.g. GMX, WEB.DE, Outlook). No more searching for your email provider in a search engine then directing toward the sign-in page, and finally entering your login details—skip all of this with easy one-click login with MailCheck from GMX. E-Mail notification in the browser Access to all your email accounts in only one tool (e.g. GMX, WEB.DE and mail.com) * Write new emails with only one click * Directly delete unwanted unread emails from the email preview panel * Manage several email accounts in one tool * Customize the (optional) notification sound * Mark mails as read in the email preview panel * Use the GMX search through the contexmenu Encrypted SSL connection and password protection with highest security standards. EULA https://agb-server.gmx.net/mailcheck/

User reviews

1.8 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

Ganz ehrlich Leute. Kann die Bewertungen teilweise nicht verstehen. Die Erweiterung macht doch was sie soll. Bin zufrieden.

eM Kay·2 Oct 2026

alles super, bin sehr zufrieden

OSWALD KRAINER·29 Sept 2026

Es verhindert, dass im angemeldeten Postfach auf die Einstellungen zugegriffen werden kann: "hilfe.gmx.net" kann nicht angezeigt werden. Anderer Browser installiert, kein Werbeblocker installiert. Tests mit verschiedene Accounts durchgeführt. Wenn man Zugriff auf die Postfach-Einstellungen haben möchte, dann GMX MailCheck nicht verwenden.

Extension files

Browse and explore files within this extension package

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URLs

110

IPv4

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

No URLs found

No IP addresses found

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Version	Size	Verdict	Findings	Permhash
8.0.5.0 Latest	2.20 MB	No malware found	0	dc87452701eb82ea343373c77c1a264765c17c2c56d7c5bed8fd23f583b68313
6.5.5	2.36 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.4.0	2.36 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.3.0	2.35 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.2.0	2.32 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.1.2	2.62 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.1.0	2.62 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.0.4	2.44 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.0.3	2.43 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be
6.0.2	2.43 MB	Not scanned	—	e5a715998e0a5779530e3948d58b0c22fe60e9ea33115215988885dcaa1ea2be

Showing 1 to 10 of 20 rows

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Code Diff

Compare extension code between any two versions.

0 changed files detected

No comparable text files found between these versions.

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What our analysis found