Bulk email website tracking detector: which companies on my list run tracking tags?
In short: Paste email addresses and see which domains' home pages load analytics, advertising or heatmap tags, with the tag names per address in the CSV. Limit: Reads the domain, never the mailbox: a tag says nothing about whether a person's address exists.
A bulk email website tracking detector reads the domain after the @ in each address and looks in its home page source for known analytics, advertising and heatmap tags. Paste up to 100 unique domains a run, or 500 after a free Google sign-in, and every address gets a row: Tracking tags seen, with the tag names, or none seen. It checks the domain, not the mailbox. Download the CSV.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Sample result
jane@acme.example is at a company whose home page loads the Google tag.
- Address
- jane@acme.example
- Domain
- acme.example
- Tag
- Google tag
What this means for you
A tag shows a service is installed, not that a campaign is running. Tags behind a tag manager aren't seen.
- Analytics, ad and heatmap tags
- Tag names per address
- Source read, scripts not run
- CSV out, nothing emailed
- Tags
- Analytics
- CSV
By SimpleVerifier Team · Last updated
Want to segment a prospect list by how active each company's site is?
- Paste it above to see which addresses are at companies running tracking tags, with a CSV of every row.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I find which companies on an email list run tracking tags?
- Paste email addresses, one per line, or upload a CSV. Addresses are found anywhere in the text, so a whole export works.
- Press Detect tracking tags. Only the unique domains are sent, never the mailbox names, 10 a request, and each home page is requested once. No mail is sent.
- Read each row: Tracking tags seen, with the tag names, or No tracking tags seen.
- Filter to the companies with tags, download the CSV, and hand the list to the mailbox check.
Example
- You enter
- Three addresses:
jane@acme.example(home page loads the Google tag),tom@globex.example(no known tags) andana@initech.example(a site that answers 403). - You get
- jane: Tracking tags seen, with the tag name. tom: No tracking tags seen. ana: Answered 403, not read. Download the CSV.
- Limits
- Up to 100 unique domains a run without an account and 500 when signed in with Google. 10 domains a request; one request to each home page.
What counts as a tracking tag?
A script or snippet in the home page source from a known analytics, advertising or heatmap service, such as the Google tag (how Google describes it). Each row names the tags found and the marker that matched.
The check reads the page source as sent. It does not run scripts.
What can a tag tell you about a company?
A tag means someone maintains the site and measures it, which is a weak sign of an active business. It is a segmenting signal for a list, not proof of a live ad campaign or of the size of the company.
To combine a site check with parking signals and mail records, use the bulk email dead company website checker.
Why is No tracking tags seen not proof of none?
Tags loaded through a tag manager or only after a cookie banner is accepted load later and are not in the source the tool reads. A missing tag therefore means none was seen, nothing more.
For the same read on bare domains, use the bulk website tracking detector.
Who uses this tool, and for what?
- Sales teams
- Segment a prospect list by whether the company site is measured.
- Marketers
- Tell active company sites from neglected ones before an import.
- Agencies
- Add a tracking-tags column to a client list audit and export it as CSV.
- Developers
- See which domains in a signup export run known tags.
What can’t this tool tell you?
- Reads the domain, never the mailbox: a tag says nothing about whether a person's address exists.
- Reads the home page source only; tags added through a tag manager or after a cookie banner aren't seen.
- A tag is not proof of a running campaign.
- Up to 100 unique domains a run without an account, 500 signed in. Free providers such as gmail.com are read like any domain.
Common questions
- How do I find which companies on an email list run tracking tags?
- Paste the addresses into a bulk email website tracking detector like this one. It reads each address's domain and looks in its home page source for known tags.
- Is this bulk email website tracking detector free?
- Yes. It is a free tool: up to 100 unique domains a run with no account, and up to 500 a run when you sign in with Google, with no card.
- Does it tell me whether the mailbox exists?
- No. It checks the domain, not the mailbox. A company with tags can still have closed a person's mailbox.
- Does a tracking tag mean the company is advertising?
- No. A tag only shows a service is installed. It does not show a campaign is running.
- Why does a busy site show No tracking tags seen?
- Its tags may load through a tag manager or after a cookie banner, which this tool does not run.
- Does it send an email to the domain?
- No. It requests each home page once and never connects to a mail server.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.