# Free email domain checker — business vs. personal

> Paste a list and split business emails from Gmail, Yahoo, and other free providers.

Free email domain checker: see which emails use a free provider like Gmail, which are business addresses, and which are invalid.

## Overview

Paste email addresses or domains — one per line, or a whole CSV column — and each one is classified as business, free provider, or invalid against the 4,768-domain free email list that HubSpot forms block with “Block free email providers”. Role mailboxes like info@ and sales@ are flagged too. The check runs in your browser, so nothing you paste is uploaded; copy the business addresses or download the results as CSV. The same rule is a free UnifAPI endpoint for your forms, CRM jobs, and agents.

## API

This page checks pasted lists in the browser. Agents and code get the same classification from the free UnifAPI Email endpoints — 0 credits per call, Bearer workspace key (or MCP):

- `GET https://api.unifapi.com/email/check?email=jane@gmail.com` — one address: `verdict` (`business`, `free`, `invalid`), `is_free_provider`, `is_role_account`, `invalid_reason`
- `POST https://api.unifapi.com/email/check/batch` with `{"emails": ["jane@gmail.com", "sales@acme.io"]}` — up to 1,000 addresses in input order, plus verdict counts
- `GET https://api.unifapi.com/email/domains/outlook.com` — one domain
- `GET https://api.unifapi.com/email/free-domains?limit=1000` — the full free-provider list, paged with `next_cursor`

```bash
curl -s -X POST https://api.unifapi.com/email/check/batch \
  -H "Authorization: Bearer $UNIFAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"emails": ["jane@gmail.com", "sales@acme.io"]}'
```

Reference: https://unifapi.com/apis/email

## Platforms

- email

## Powered by

- [Email · Check up to 1,000 emails](https://unifapi.com/apis/email)
- [Email · Check a domain](https://unifapi.com/apis/email)
- [Email · List free email domains](https://unifapi.com/apis/email)

## FAQ

### What counts as a free email domain?

A domain anyone can sign up on for a personal mailbox: Gmail, Yahoo, Outlook and Hotmail, iCloud, AOL, GMX, Mail.ru, QQ, and thousands of regional and legacy providers. The checker uses the 4,768-domain list that HubSpot forms block with “Block free email providers”, so a free result here predicts what that setting would do with the same address.

### Does “business” mean the email address is real?

No. Business means the syntax is valid and the domain is not on the free-provider list. The checker does not look up MX records, contact the mail server, or detect disposable inboxes, so a business address can still bounce. Use it to sort a list, not to verify deliverability.

### Are the emails I paste uploaded anywhere?

No. The domain list loads into the page and every check runs in your browser; the addresses you paste are not sent to UnifAPI. Because nothing runs on a server, there is no rate limit — paste up to 10,000 entries at once.

### Why are info@ and sales@ flagged?

They are role mailboxes: shared inboxes for a team or function rather than a person. They are still business addresses, so the result stays business, but many teams score and route them differently from a named contact.

### Does it catch subdomains and newer providers?

Matching is exact, so a company subdomain is not marked free just because a parent domain is on the list. The list also misses some newer providers — proton.me, tuta.com, and hey.com are not on it — so keep your own blocklist for those if they matter to your forms.

### Is there a free email filter API?

Yes. GET /email/check classifies one address, POST /email/check/batch takes up to 1,000 per call, GET /email/domains/{domain} checks a domain, and GET /email/free-domains pages through the whole list. Every call costs 0 credits with a UnifAPI workspace key, and agents can call the same endpoints through MCP.

## Go deeper

- [Block free email domains on B2B forms](https://unifapi.com/blog/block-free-email-domains) — What the free email domain list covers, where it misfires, and how to apply it.
- [Email filter API](https://unifapi.com/apis/email) — Four free endpoints for forms, CRM jobs, and agents.
- [LinkedIn company analyzer](https://unifapi.com/tools/linkedin-company-analyzer) — Size up the company behind a business email domain.

## Links

- HTML: https://unifapi.com/tools/free-email-domain-checker
- Tools index: https://unifapi.com/tools.md
- Skills index: https://unifapi.com/skills.md
- Pricing: https://unifapi.com/pricing.md