com.mailtester/email-verification
MailTester Email Verification
Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.
alive probed 2026-10-14 · HTTP 200
9tools
1.4ktokens in Claude Opus 5.5
1.4ktokens in Claude Code
0.7 %of a 200k context window
764o200k_base estimate
825 msto initialize
566 msto list tools
- Endpoint
- https://app.mailtester.com/mcp (streamable-http)
- Host
- app.mailtester.com
- Protocol
- 2024-11-05
- Reports itself as
- MailTester 1.0.0
- Capabilities
- tools
- Instructions
- 445 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-13. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mailtester-com/mailtester-mcp
- Website
- https://app.mailtester.com/agent-gateway
- Registry
- active, updated 2026-10-08 · registry entry
- Reachable
- 3 of the last 3 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| estimate_cost | 149 | 20 % |
| explain_result | 131 | 17 % |
| get_api_key | 125 | 16 % |
| verify_batch | 95 | 12 % |
| verify_email | 65 | 9 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-14 18:21 | alive | 1.5 s | 9 | 1.4k | 764 |
| 2026-10-13 11:07 | alive | 895 ms | 9 | 1.4k | 764 |
| 2026-10-09 11:09 | alive | 825 ms | 9 | 1.3k | 745 |
Badge and feed
[](https://mcpcost.ulehla.dev/s/com.mailtester/email-verification)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.