MailTester Email Verification
Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.
Connect it
Settings → Connectors → Add custom connector
URL: https://app.mailtester.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://app.mailtester.com/mcp{
"mcpServers": {
"email-verification": {
"url": "https://app.mailtester.com/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}claude mcp add --transport http email-verification https://app.mailtester.com/mcp --header "Authorization: <value>"{
"servers": {
"email-verification": {
"type": "http",
"url": "https://app.mailtester.com/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}9 tools, verified live
get_api_keyGet 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 — reconnect with 'Authorization: Bearer <api_key>' for your own quota and the list tools.
get_credit_balanceGet the current credit balance and a short usage summary for the account.
list_listsList the user's bulk verification lists/jobs, most recent first.
get_listGet the details of a single bulk verification list by its id.
explain_resultExplain 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, abuse, do-not-mail, no-mx, disabled, and network. Use when a user asks what a result means.
verify_emailVerify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit.
verify_batchVerify 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.
estimate_costEstimate 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 quote this before proposing anything billable.
get_batch_statusGet the progress and status of a bulk verification list/job by id.
Alternatives in Email & Messaging
Compare →
Benchmark Email MCP by usefulapiB
Manage Benchmark Email lists and contacts, and read campaign reports: opens, clicks, bounces.
Trengo MCP by usefulapiB
Work tickets and messages, look up contacts and teams, pull reports, and reply, assign or close.
Together AI MCP by usefulapiB
Run Together AI chat, embeddings and images; manage fine-tunes, batches and endpoints.
Squadcast MCP by usefulapiB
Read incidents, services, teams, on-call schedules; acknowledge, resolve and note incidents.
Spruce Health MCP by usefulapiB
Read Spruce Health contacts, conversations, messages, phone lines and team members (read-only).
Smoobu MCP by usefulapiB
Check vacation-rental reservations, rates, availability and guest messages, and update bookings.