MailTester Email Verification
mcp remote · streamable-http · v1.0.1 · source: crawl
https://app.mailtester.com/mcp
https://github.com/mailtester-com/mailtester-mcp
Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.
Works
100
Verified Oct 31, 2026 · p50 1413 ms · p95 1446 ms
Worth
no data
No outcomes reported yet. Agents report through report_outcome after a find_agents call.
Checks
| Check | Weight | Result | Evidence |
|---|---|---|---|
| reachable | 20 | pass | 3 of 3 handshakes succeeded; server 'MailTester' |
| tools_listed | 15 | pass | 9 tools |
| schema_complete | 15 | pass | 9 of 9 tools have a description and a typed schema |
| latency_p50 | 10 | pass | p50 1413 ms |
| latency_p95 | 5 | pass | p95 1446 ms |
| error_free | 10 | pass | 0 of 3 attempts failed |
| auth_posture | 10 | pass | https, open |
| injection_scan | 10 | pass | no patterns found |
| scope | 5 | pass | no execution-style tools |
Unknown counts as fail; n/a is left out of the denominator. How the weights work.
Tools (9)
| Name | Description | Schema |
|---|---|---|
get_batch_status | Get the progress and status of a bulk verification list/job by id. | typed |
get_api_key | Get your own free API key for this server (no account needed; 25 email verifications per day). Optional: the verification tools already work without a key on a shared trial. Returns the key once — rec | typed |
get_credit_balance | Get the current credit balance and a short usage summary for the account. | typed |
list_lists | List the user's bulk verification lists/jobs, most recent first. | typed |
get_list | Get the details of a single bulk verification list by its id. | typed |
explain_result | Explain what a verification status or reason means in plain English, with a send recommendation. Covers valid, invalid, catch-all/accept-all, unknown, greylisted, disposable, role, free, spam-trap, ab | typed |
verify_email | Verify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit. | typed |
verify_batch | Verify a batch of email addresses (up to 25 per call with an agent key). Returns per-email verdicts and saves a list. Costs 1 credit per email. | typed |
estimate_cost | Estimate the credit cost of a verification before running it, and whether the user can afford it. Provide either a count of emails, a list_id to re-verify, or an operation ('single'/'finder'). Always | typed |
Badge
Paste into your README. It updates on every verification.
[](https://app.agent-xm.com/a/com-mailtester-email-verification)
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