What an email tracker extension can actually see

28 August 2026 · 2 min read · The Bulk Mail team

An email tracker extension runs inside the page where you read and write your email. That is a meaningful amount of access, and it is worth understanding before you click Add to Chrome — on any tracker, ours included.

What "access to mail.google.com" means

To add a tracking pixel as you send and to draw a status chip next to a thread, an extension has to run code on the Gmail page. Chrome describes that as reading and changing your data on the site. It is the same permission that makes the feature possible; there is no version of this that works without it.

What matters is the scope. An extension whose job is Gmail should ask for Gmail. If the prompt says "on all websites" for a Gmail-only tool, that is a reason to look at something else.

What gets stored on a server

Tracking needs a server, because the pixel has to be hosted somewhere and the open has to be recorded somewhere. For a well-built tracker, what leaves your browser is small: which of your sends is being tracked, and the open events that come back — time, device type, rough network location.

• Ask whether the body of your emails is sent anywhere. It does not need to be.
• Ask how long open records are kept, and whether you can delete them.
• Ask whether the data is used for anything other than showing it to you.

The other side of the transaction

Tracking also collects information about your recipients — that they opened something, when, and roughly where. Two reasonable rules: turn tracking off for personal correspondence, and turn it off for anyone who has asked you not to track them. A per-message switch makes both easy.

Open events belong to your account and nobody else. On Bulk Mail, free accounts keep 30 days of history server-side, and you can wipe everything we hold about your sends whenever you want.

A short checklist

• Permission scope matches the job — one site, not all sites.
• Nothing visible is added to the messages you send.
• You can delete your history, in full, on demand.
• The tool tells you what it cannot do, not only what it can.