io.github.MailboxValidator/mcp-mailboxvalidator
MailboxValidator
Is the MailboxValidator MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.
Email validation MCP server using the MailboxValidator API. It can validate email addresses.
alive probed 2026-11-14 · unchanged since 2026-10-30
- Run it
- npx -y mcp-mailboxvalidator@1.0.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- mailboxvalidator 1.0.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 433 tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 484. The o200k_base estimate is 234. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/MailboxValidator/mcp-mailboxvalidator
- Registry
- active, updated 2026-05-28 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.85×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| check_disposable_email | 146 | 79 | 34 % |
| check_free_email | 144 | 78 | 33 % |
| validate_email | 142 | 77 | 33 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- Kenmet io.github.Magic-Resume/magic-resume · needs env
- io.github.Maher-Reven/asdesigned · crashed on start
- tx402 io.github.Mahesvannan/tx402 · alive
- io.github.Mahfod-dev/flowcontent · alive
- MakeMyClip Editor io.github.MakeMyClip/editor · needs env
- io.github.MakkCH/minecraft-mcp · needs env
- Frame Lens io.github.Makkov-design/framelens · alive
- Vaults Diagram Tools io.github.Malnati/vaults-diagram-tools · crashed on start
Servers that mention validation or addresses.
- MainBook Bank Statement Converter ai.mainbook/bank-statement-converter · alive
- Probity Wallet Reputation ai.probitylabs/wallet-reputation · alive
- ai.plith/plith · alive
- SignalHarness.ai ai.signalharness/mcp · server error
- ai.smithery/DynamicEndpoints-powershell-exec-mcp-server · not found
- Branddock app.branddock/branddock · needs auth
- Command Mail app.commandmail/mail · needs auth
- ai.smithery/demomagic-duckchain-mcp · not found
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.