How to Detect the Website Platform Behind Every Email Address on a List

To detect the website platform behind an email list, read the home page of the domain after the @ in each address and look for known platform markers in its source, generator tag and headers. The bulk email website platform detector does this for every address in a pasted list or CSV and gives each one a row.

The check reads the domain, not the mailbox.

Why check this on an email list

Sales and agency lists are 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.

The by-hand way

1. Take the domain after the @, for example acme.example from sam@acme.example.
2. Open its home page and view the page source.
3. Look for a generator meta tag, platform script paths and response headers that name a platform.
4. Repeat for every unique domain.

For a plain list of websites, see detect the CMS of many websites at once.

Step 1: paste the addresses

Paste addresses one per line, or upload a CSV. Only the unique domains are sent, never the mailbox names.

Step 2: run the check

Press Detect website platforms. One GET of each home page is made from our server (https first, then http, up to five redirects, the first 128 KB), with no cookies and nothing stored. No mail is sent.

Step 3: read the result

Result	What it means
A platform name	A known marker was in the source, generator tag or headers
No platform marker	The page was read and none of the known markers was there
HTTP error / No answer / Not checked	The page could not be read; some sites refuse automated requests

The CSV carries the platform summary and the final site address beside each email. No address is dropped from the list handed on to the mailbox check.

What this check cannot do

• It checks the domain, not the mailbox.
• A theme, a CDN or a site drawn by JavaScript can hide the real platform.
• Only the first 128 KB of the home page is read.
• Up to 100 unique domains a run without an account, 500 signed in.

To read the same markers for a plain list of websites use the bulk website CMS detector.

Next: the rest of the list

For the addresses that remain, use the verify page: the first 100 checks are free with a Google sign-in, no card.

Try it now

Paste your list into the bulk email website platform detector at simpleverifier.com.