# Mail Tester Ninja (mailtester.ninja)

Tests email addresses in real time for syntax and deliverability, and finds addresses from name and domain inputs, via web or API.

- Atlas card: https://inite.ai/en/atlas/mailtester.ninja
- Site: https://mailtester.ninja
- For: Email marketers and sales teams cleaning mailing lists and finding prospect addresses for outreach
- Use not measured/100 · alive 100/100

## Used for

- confirm a single address is deliverable before sending
- remove invalid addresses from a mailing list before a campaign
- locate missing addresses for outreach contacts

## Price

Not read yet.

## For developers

- OpenAPI: https://mailtester.ninja/openapi.json (1 paths)
- MCP server: ninja.mailtester/email-verification (namespace; open on 2026-10-29, 2 tools)
- Read 2026-10-29

## MCP server, measured daily

Server: https://mcp.mailtester.ninja/mcp, checked every day since 2026-10-29 (6 checks).

- Answered: measuring, 6 daily checks so far
- Median first answer: 521 ms
- Sign-in: none
- Context its tool definitions take: about 417 tokens (2 tools)
- Tool definitions: A, 100/100
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: gdpr
- Read 2026-10-29

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Source: INITE Atlas, https://inite.ai/en/atlas/mailtester.ninja. JSON: https://inite.ai/api/atlas/mailtester.ninja. MCP: https://inite.ai/api/mcp (atlas_lookup).