MailTester Email Verification

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable.

Connector by mailtester.comOfficial · Domain verified by the MCP Registry

IndexedLicense unknownRemote (HTTP)

Chalk Labs

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Install

Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install connector/mailtester-com-email-verification

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

https://app.mailtester.com/mcp Remote (HTTP)

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About

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.

Reviews

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No reviews yet. Installed it? Reviews come from verified installers only. How reviews work

Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools: 9 read · 0 write · 0 deleteRead-only
Secrets: 1 (API keys, tokens or passwords)
Install scripts: Nothing to install (hosted)
Runs as: Hosted (remote endpoint)

Tools by what they do 9

From the running server's own tool list (tools/list) on Oct 25, 2026.

Read 9 · Look things up without changing anything.

estimate_cost
explain_result
get_api_key
get_batch_status
get_credit_balance
get_list
list_lists
verify_batch
verify_email

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

Authorization

Network hosts it talks to 1

app.mailtester.com · found in remote endpoint, install command

Tools (9)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

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 quote this before proposing anything billable.
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, abuse, do-not-mail, no-mx, disabled, and network. Use when a user asks what a result means.
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 — reconnect with 'Authorization: Bearer <api_key>' for your own quota and the list tools.
get_batch_status
Get the progress and status of a bulk verification list/job by id.
get_credit_balance
Get the current credit balance and a short usage summary for the account.
get_list
Get the details of a single bulk verification list by its id.
list_lists
List the user's bulk verification lists/jobs, most recent first.
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.
verify_email
Verify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit.

Signals

Stars: 0
Forks: 0
Open issues: 1
Last commit: Oct 8, 2026 (23 days ago)
Last release: Oct 8, 2026 (23 days ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name: com.mailtester/email-verification
Version: 1.0.1
Auth: Bearer token
License: License unknown
Repository: github.com/mailtester-com/mailtester-mcp
Website: app.mailtester.com/agent-gateway
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: Official MCP Registry github-graphql

Rank

of 44,833 in Connectors

Score

0.586

Security 30%not yet
Popularity 25%0.29
Freshness 20%1.00
Rating 15%not yet
Docs 10%0.87

How ranking works →

Grades

Freshness

Active in the last 30 days. Last activity 23 days ago.

–

Security

Security scan: in progress. Grades from our dependency, secret, code and prompt-injection checks appear here once they launch. Until then, check the code before you install.

Indexed

Found automatically from a public source. Not yet claimed by its publisher.

How grades work →

Availability

100% uptime, last 30 days (1 check)

Last check: 6 days ago
Status: Up
Median response: 547 ms

Up
Up, auth required
Down
Not checked
No data

A daily MCP handshake with the remote endpoint. “Auth required” means it answered and wants a login or key. “Not checked” means the URL needs your own account or blocks automated checks.

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Chalk Labs is a two-founder AI and growth studio. We build AI agents, CRMs and MVPs for Web3 and AI companies, and have shipped 50+ product and token launches.

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Press we've placed: Forbes · CoinDesk · Decrypt · Cointelegraph · The Block

Rahil Jain, Co-founder, Chalk Labs. Ex-Goldman Sachs engineer. You talk to the person who builds it.

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Cite this page

MailTester Email Verification MCP server. Agent Mart. https://agentmart.dev/connectors/mailtester-com-email-verification (last updated 2026-10-24)