There is a line that appears under a lot of tracked emails. Sent with something. Tracked by something. A small logo, sometimes a link. It is the price of the free tier on several email tracking tools, and it is charged to the wrong person: not to you, to the person you wrote to.

I build one of these tools and mine does not do this, so read this as an interested account. I have tried to keep the argument checkable independently of who is making it.

What the line actually announces

Read it from the recipient's side, once, slowly.

They opened a message from you. At the bottom, under your name, there is a sentence they did not expect that tells them the message was sent through a tool that watches what they do with it. They did not learn that you track your emails. They learned it from your email, in the middle of reading it.

That is a different event from being tracked. Plenty of people are relaxed about tracking in the abstract and still react to being told about it at that exact moment, in that exact place. The line converts an invisible practice into an announcement.

Where it costs the most, in order

A job application. You spent an evening on the letter. It arrives with a footer saying it was sent through a tracking tool. The reader now knows two things about you: that you want to know when they open it, and that you used a free plan that advertises itself on your behalf. Neither is what you were trying to communicate.

A commercial proposal. Same message, different relationship. A quote that carries a tracking signature tells the client something about how you operate before they have read a number. And in a business inbox it may also trip a filter, because a footer with an external link and an image is a pattern that scanners are built to notice.

A first email to anyone. Cold outreach, an introduction, a message to someone senior. The signature is a claim about you made by software you did not write, at the bottom of the only message that person will ever read from you.

Where it costs nothing: internal email to colleagues who already know, and mailing list campaigns where a footer is expected and required. If that is your whole use case, this article does not apply to you.

The part that is easy to get wrong

Removing the signature does not make the tracking invisible. I want to be exact about this, because the opposite claim is a good sales line and it is false.

Any tracking that works by embedding a remote image leaves that image in the message. A recipient who views the message source will find it. A recipient whose client blocks remote images will see the prompt asking whether to load them, which is a signal in itself. And a corporate mail system may strip or rewrite it in ways that are visible to an administrator.

So the honest claim is narrower and still worth something: without a signature, nothing is added to what your recipient reads. No sentence, no logo, no link, no advertisement for a product they did not choose. What remains is a mechanism they can find if they look, and most people do not look at message sources.

If you want the stronger guarantee, that no one can tell, no tool in this category can give it to you. Ask for a read receipt through your mail provider's own feature, which asks the recipient's permission and lets them decline. That is the only version that is fully honest by design, and it is also the version almost nobody uses, because permission is usually refused.

How to check what your tool does, in one minute

Do not read the pricing page. Send yourself a message.

Send a test to an address you control on another provider, then open it there and read the bottom of the message. If a line has been added, you have your answer.

Then view the source and search for the name of your tool. This shows you what else travels with your message: the tracking image, any rewritten links, and any headers the tool added.

Do both on the plan you actually use. Signatures are usually attached to free tiers, and a tool that adds nothing on its paid plan will still add something today if you have not paid. The behaviour you need to know about is the behaviour of your current plan.

What I would want stated plainly by any tool in this category

Whether anything is added to the outgoing message, on every plan, in one sentence, on the page where you choose a plan rather than in a support article.

Whether the tool needs access to your mailbox, and what that access covers, in the same place.

And whether the open count can be wrong, which it always can, for reasons that have nothing to do with signatures: security scanners, preloading proxies, image caching and forwarding all produce opens that no human performed.

A tool that answers those three questions plainly is telling you what it is. A tool that answers them in marketing language is telling you something too.

Disclosure

I build BlueTicks for Gmail, a Chrome and Firefox extension that shows WhatsApp-style read receipt ticks in your Gmail sent list. Nothing is added to the message your recipient receives, on any plan, including the free one. No signature, no footer, no branded link. It never asks for access to your Google account, and it costs 4 dollars a year with a free tier.

Every limitation in the section above about what a signature does not hide applies to it exactly as it applies to any other tool built on the same mechanism. That is not a confession, it is the specification.

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