Bulk email website platform detector: what is each address's company website built on?
In short: Paste email addresses and see the platform marker each company's website shows, read from the home page source and headers, with the CSV keeping each address. Limit: Reads the domain, never the mailbox: a website platform says nothing about a particular address.
A bulk email website platform detector reads the domain after the @ in each address and looks at its home page source, generator tag and response headers for known platform markers. Paste up to 100 unique domains a run, or 500 signed in. Each row names the platform it saw. It checks the domain, not the mailbox. Download the CSV.
Know what their sites run on? Check the mailboxes behind them.
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
tom@globex.example is at a company whose website shows a platform marker in its page source.
- Address
- tom@globex.example
- Evidence
- meta generator tag
- HTTP status
- 200
What this means for you
The platform is read from the generator tag and headers, so it is a signal, not a certainty.
- Platform named with its evidence
- Sites that hide it say so
- Unreadable sites kept in the list
- CSV out, nothing emailed
- Platform
- Headers
- CSV
By SimpleVerifier Team · Last updated
Got a list of company addresses and want to segment by website platform?
- Paste it above to read the platform marker on each company's home page, with the final site address in the CSV.
- 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 the platform behind each address on an email list?
- Paste email addresses, one per line, or upload a CSV. Addresses are found anywhere in the text, so a whole export works.
- Press Detect website platforms. Only the unique domains are sent, never the mailbox names, 10 a request: one GET of each home page from our server, no cookies, nothing stored. No mail is sent.
- Read each row: the platform marker the site shows, No platform marker, or why the page could not be read.
- Filter to a platform, download the CSV with the final address of the site beside each email, and hand the list to the mailbox check.
Example
- You enter
- Four addresses:
jane@acme.example(a site with a platform generator tag),tom@globex.example(a site behind a CDN with a platform header),ana@initech.example(a custom build with no marker) andbo@umbrella.example(a site that answers 503). - You get
- jane: the platform's name. tom: the platform named from its header. ana: No platform marker. bo: HTTP error, with the status in the note. 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 GET of each home page, first 128 KB.
What does the check read?
One guarded GET of the bare domain's home page, https first and then http, up to five redirects and the first 128 KB. Known markers in the page source, the generator meta tag and the response headers are matched against a list of platforms, and each row names what matched. Only public addresses on ports 80 and 443 are fetched.
A marker is a signal, not a certainty: a theme, a CDN or a site rendered by JavaScript can hide the real platform, so No platform marker does not mean there is none.
Why read the platform behind an email list?
A sales or agency list is often segmented by what a company's site runs on, because the offer differs for a shop on one platform and a blog on another. A list of thousands of addresses has far fewer unique domains, so reading one home page per domain is cheap.
Free mail domains such as gmail.com are read like any other domain, so those rows describe the provider's own site, not a person's company.
What do you do with the rows?
Filter to the platform you sell to and keep the CSV. To see which of those sites answer at all, use the bulk email website status checker, and to see which run tracking tags, the bulk email website tracking detector.
Before you email anyone on the list, verify the addresses.
Who uses this tool, and for what?
- Agencies
- Segment a prospect list by the platform its websites run on.
- Sales teams
- Pitch platform-specific offers to the right addresses.
- Marketers
- Split a list into shops, blogs and custom sites before a campaign.
- Developers
- Triage a signup export by the kind of company behind each address.
What can’t this tool tell you?
- Reads the domain, never the mailbox: a website platform says nothing about a particular address.
- Only the first 128 KB of the home page and its headers are read. Markers added by JavaScript are not seen.
- A theme, a CDN or a headless build can hide the real platform.
- 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 the platform behind each address on an email list?
- Paste the list into a bulk email website platform detector like this one. It reads each address's domain and looks for platform markers in the home page source and headers.
- Is this bulk email website platform 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 the platform tell me anything about the mailbox?
- No. It checks the domain, not the mailbox. A platform marker says how a site was built, not whether an address works.
- Why does a row say No platform marker?
- The home page was read and none of the known markers was in it. A custom build, a headless site or a page drawn by JavaScript shows none.
- Why was a site not read?
- It didn't answer, answered an error, or refused automated requests. Some sites answer 403 here and still load in a browser.
- Does it send an email to the domain?
- No. It makes one GET of the home page 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.