How Accurate Is Email Open Location Tracking?

When a tracked email is opened, the app can often show a city on a map. It is the feature people find most striking, and also the one most likely to be misunderstood. Here is what that location really is, how accurate it tends to be, and why the honest answer is sometimes “unknown”.

Where the location comes from

There is no GPS involved, no access to the recipient’s phone, and no access to their mailbox. The only ingredient is an IP address.

When the recipient’s mail app loads the tracking pixel, that request arrives at the server from an IP address. IP addresses are allocated to networks, and companies maintain databases that map address ranges to approximate places. The result is a best guess about where the network is, not where the person is. The mechanics behind the request are covered in how email tracking pixels work.

That distinction is the whole article. The location describes a network. Most of the time the network is near the person. Sometimes it is not.

How accurate it really is

MaxMind, one of the longest running IP geolocation providers, publishes accuracy figures for its own data, and they are a reasonable guide to what any IP based location can achieve.

Two things stand out. First, the country is nearly always right. Second, the city is a reasonable guess rather than a fact, and the 50 kilometer radius in that city figure is doing real work. A result that names your recipient’s metropolitan area is a success by this measure even if it names a suburb they have never visited.

Accuracy also varies a lot by country. The figures above are for the United States, and smaller countries with fewer registered address blocks can do noticeably worse at the city level.

What it definitely cannot do

MaxMind states it plainly in its own documentation: IP geolocation data is never precise enough to identify or locate a specific household, individual, or street address.

So an email open cannot tell you which building someone is in, which room they are in, or whether they are at home or at work. If a product suggests it can pinpoint a person’s address from an email open, that is a claim the underlying data does not support.

Five things that move the pin

VPNs

A VPN replaces the reader’s IP address with the VPN server’s. Someone in Ohio reading email through a VPN may appear in Frankfurt or Singapore. This is not a failure of the tracking, it is exactly what the VPN is for.

Mobile networks

Carriers assign addresses from pools that can cover an entire region, and route traffic through a limited number of gateways. An open from a phone on cellular data often lands on the nearest large city rather than the town the person is standing in.

Corporate gateways

Many organizations route all employee internet traffic through a central point. If the company’s gateway sits in London, every employee looks like they are in London, whether they are in Manchester or working from a kitchen table in Leeds.

Home internet moves

Internet providers reassign address blocks and do not always update the registries promptly. An address that mapped correctly last year can quietly start pointing somewhere else.

Proxies and pre-fetchers

The largest category. Gmail serves images through Google’s proxy servers, and Apple Mail with Protect Mail Activity fetches images through relays. In both cases the address belongs to the provider, not the reader.

Why the app shows unknown instead of a data centre city

This is a deliberate design decision, and the reasoning is worth spelling out.

Google’s Workspace documentation states that when users open email messages, Gmail uses Google’s secure proxy servers to serve images that might be included in them. Gmail’s own help page for users goes further and says that senders cannot use image loading to get information about your computer or location.

That means the IP address on a Gmail open belongs to Google. Mapping it would produce a real looking city, probably wherever the relevant Google infrastructure sits, and it would be completely wrong about the reader. So when the address is recognizably a proxy or data centre, Email Tracker records the open and its time and shows the location as unknown.

You lose a pin on a map. You avoid confidently telling yourself that a client in Chicago read your proposal in a city they have never been to. For a Gmail recipient, the useful part of the signal, that the message was opened and when, still comes through. See tracking Gmail emails on iPhone for what that looks like in practice.

The same logic applies to Apple Mail’s pre-fetch, except there the app goes a step further and does not report an open at all, as explained in Apple Mail Privacy Protection and email tracking.

How to read a location sensibly

Use the country. It is the part you can rely on. If you sent a proposal to a company in Dublin and the open shows Ireland, that is consistent. If it shows Brazil, something interesting has happened, most likely a VPN or a forward.

Treat the city as a region. Read it as “somewhere around here” rather than a specific place. A neighboring city is a normal, expected result.

Use it for patterns, not for facts. Several opens from the same area suggest one reader. An open from a very different place, days later, hints that the message was passed on. Neither is proof, because a pixel cannot identify anyone. What tracking can and cannot establish is covered in how to know if someone read your email.

Never use it to check up on a person. Beyond the ethics, the data is not good enough to support that use even if you wanted to. And in the EU and UK, tracking pixels carry transparency and consent expectations that are worth understanding before you point one at an individual. See is email tracking legal.

What is stored

Being straight about this matters more than a marketing line. To show you an open, the service records the tracked email’s subject and the open events, which include the IP address, the approximate location derived from it, and the user agent string when one is available. That is how the history in the app exists at all. There is no access to your mailbox and no sign in to your email account, but the open data does live on a server, and it would be dishonest to say otherwise.

In short

Email open location is a useful, rough signal. Country: reliable. City: a decent guess with real error bars. Street: impossible. Unknown: not a bug, but the app declining to invent a place.

Email Tracker is a free download on the App Store for iPhone, with an optional subscription. It shows the open time, the open count, and an approximate location when there is a real one to show. If you are wondering why an open has not appeared at all, start with why email opens are not showing.