# CheckMX (checkmx.dev)

Runs cold email campaigns and follow-up sequences across your own mailboxes, with warm-up and email address checks before sending.

- Atlas card: https://inite.ai/en/atlas/checkmx.dev
- Site: https://checkmx.dev
- For: Sales and outreach teams sending cold email from their own Gmail, Outlook or SMTP mailboxes
- Categories: sales
- Use not measured/100 · alive 100/100

## Used for

- Check whether an address will accept mail before outreach
- Run multi-step follow-up sequences across connected mailboxes
- Review replies from all mailboxes in one inbox

## Price

- from 37 USD/month, free plan (read 2026-10-31 on https://checkmx.dev/pricing)

## For developers

- API docs: https://checkmx.dev/api-docs
- MCP server: dev.checkmx/checkmx (namespace; auth on 2026-10-31)
- Read 2026-10-31

## MCP server, measured daily

Server: https://checkmx.dev/mcp, checked every day since 2026-10-31 (2 checks).

- Answered: measuring, 2 daily checks so far
- Median first answer: 611 ms
- Sign-in: OAuth (the client signs the user in)
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-31

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