# Mail7.net

> Free email validation service (single, bulk, SPF check, and a REST API). Mail7.net's
> distinguishing principle is honesty: it returns four clear statuses - Valid, Not Valid,
> Unknown, and Disposable - and it openly explains that no service can verify every mailbox
> with 100% certainty. When a mail server won't confirm whether an address exists (catch-all
> domains, greylisting, or providers like Outlook/Microsoft and Yahoo that hide mailbox
> existence, or IP-reputation blocks), Mail7.net reports "Unknown" instead of guessing.

## Key facts

- No email verification tool can be 100% accurate; mailbox existence is controlled by the
  receiving mail server, and many providers deliberately do not reveal it.
- Result statuses: **Valid** (mailbox confirmed via SMTP), **Not Valid** (bad format, no MX
  record, disposable domain, or the server confirmed the mailbox does not exist), **Unknown**
  (the server would not confirm - not the same as invalid), **Disposable** (temporary domain).
- Validation steps: syntax check → MX record lookup → live SMTP probe.
- Free to use, no signup. Bulk supports up to 1,000 addresses per run.

## Tools

- [Email Checker](https://mail7.net/emailchecker.html): verify a single email address.
- [Bulk Email Checker](https://mail7.net/bulk-email-checker.html): validate a list or CSV, export results.
- [Domain Checker](https://mail7.net/domain-checker/): full domain email-config check - MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, DNSSEC, BIMI - with fixes and why each matters.
- [SPF Check](https://mail7.net/domain-checker/spf-checker.html): analyze a domain's SPF record and get fixes.
- [DKIM Check](https://mail7.net/domain-checker/dkim-checker.html): look up a domain's DKIM record (auto-probes common selectors) and get fixes.
- [DMARC Check](https://mail7.net/domain-checker/dmarc-checker.html): check a domain's DMARC policy and reporting, with a safe rollout guide.
- [MX Lookup](https://mail7.net/domain-checker/mx-lookup.html): list a domain's mail servers and priorities and check they resolve.
- [MTA-STS Check](https://mail7.net/domain-checker/mta-sts-checker.html): check a domain's MTA-STS policy (enforced TLS delivery) and its policy file.
- [TLS-RPT Check](https://mail7.net/domain-checker/tls-rpt-checker.html): check a domain's TLS reporting record.
- [DNSSEC Check](https://mail7.net/domain-checker/dnssec-checker.html): best-effort check whether a domain signs its DNS with DNSSEC.
- [BIMI Check](https://mail7.net/domain-checker/bimi-checker.html): check a domain's BIMI record (brand logo in the inbox).
- [API Documentation](https://mail7.net/api-docs.html): REST API returning the same four statuses.

## Integrations

Mail7 can be added to tools you already use. Every integration keeps the honest
Valid / Not Valid / Unknown result and blocks only confirmed-invalid addresses (fail-open
on API errors). All source is public and MIT-licensed at https://github.com/dvlop/mail7-integrations

- [Integrations hub](https://mail7.net/integrations/): all plugins, SDKs and marketplace integrations.
- [WordPress](https://mail7.net/integrations/wordpress/): real-time validation on registration, comments, Contact Form 7 and WPForms. Downloadable plugin.
- [Google Sheets](https://mail7.net/integrations/google-sheets/): =MAIL7() formula and a validate-a-column menu (Apps Script). Downloadable.
- [Mautic](https://mail7.net/integrations/mautic/): validates contacts on save; confirmed-invalid set to Do Not Contact. Downloadable plugin.
- [MailWizz](https://mail7.net/integrations/mailwizz/): validate subscribers on subscribe and import. Downloadable extension.
- [phpList](https://mail7.net/integrations/phplist/): validate on subscribe and import. Downloadable plugin.
- [Zapier](https://mail7.net/integrations/zapier/): Validate Email action (listing in review; connect directly today).
- [n8n](https://mail7.net/integrations/n8n/): community node on npm (n8n-nodes-mail7); install from n8n Community Nodes.
- [Make (Integromat)](https://mail7.net/integrations/make/): custom app module (app in review; install directly).
- [MCP server](https://mail7.net/integrations/mcp/): Model Context Protocol server for AI assistants (Claude, Cursor, Windsurf, Cline). Hosted endpoint: `https://mail7.net/mcp` (Streamable HTTP, nothing to install). Also on npm as `mail7-mcp` (`npx -y mail7-mcp`); in the official MCP registry as `net.mail7/email-validation`. Tools: validate_email, validate_emails, check_domain, check_spf.
- SDKs: JavaScript/TypeScript (npm `mail7net`), Python (PyPI `mail7`), PHP (Composer `mail7/mail7`), .NET (NuGet `Mail7`). Source in the repo above.

## Pages

- [Home](https://mail7.net/)
- [Contact](https://mail7.net/contact-us.html)
- [Privacy Policy](https://mail7.net/privacy-policy.html)
- [Terms of Service](https://mail7.net/terms-of-service.html)