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MailTester Ninja

By mailtesterAll Mailtester servers

Verify email addresses live against their mail server and find work emails. Nothing stored.

First seen 28 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.

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Directories
Collected by InvokeRank
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Tools
From an anonymous probe
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ToolBench grade
Not graded by Arcade
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GitHub stars
No repository data

Tools

ToolDescriptionBehaviour
find_emailFind the work email address of a person from their name and their company domain. Tries the 6 most common patterns (first.last, flast, first, firstlast, first_last, f.last) one by one and returns the first address the mail server accepts. Stops early when the domain accepts every address (catch-all) and then gives the most common pattern as "guess". Each pattern tried counts as one verification. Personal email providers such as gmail.com are not searched. Requires a paid MailTester Ninja key.Read-only
verify_emailCheck in real time whether an email address exists and can receive mail, by asking the recipient's mail server (no message is sent). Returns code "ok" (valid), "ko" (invalid) or "mb" (uncertain, such as a catch-all domain) with a message.Read-only

Directory listings

DirectoryListingTierFirst seen
Official MCP RegistryMailTester Ninja-28 Oct 2026