# ListCheckup (listcheckup.com)

Checks each address on a mailing list against its mail server and reports whether it is valid, invalid, risky, catch-all or unknown.

- Atlas card: https://inite.ai/en/atlas/listcheckup.com
- Site: https://listcheckup.com
- For: Marketers and teams sending email campaigns who want to clean their own subscriber lists first
- Categories: dev
- Use not measured/100 · alive 100/100

## Used for

- clean a self-built email list before sending
- check a single address on demand
- watch list domains for stopped mail acceptance

## Price

- from 5 EUR/one-time, free plan (read 2026-10-27 on https://listcheckup.com/pricing)

## For developers

- API docs: https://listcheckup.com/api
- MCP server: com.listcheckup/mcp (namespace; auth on 2026-10-27)
- Read 2026-10-27

## MCP server, measured daily

Server: https://listcheckup.com/mcp, checked every day since 2026-10-27 (7 checks).

- Answered: 100% of daily checks
- Median first answer: 554 ms
- Sign-in: a pasted key
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-27

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