Unverified60% confidenceFactExact time
Holehe is an open-source OSINT tool that can detect whether a given email address has been registered on hundreds of websites.
2
Sources
60%
Confidence
Long-term
Relevance
8/15/2026
First Seen
Sources
Holehe：通过邮箱反查注册账号的开源OSINT工具
Related Claims
Unverifieduser-scanner contains 175+ email scanning vectors for associated account discovery, registered platform identification, leaked record matching, and more.66% similarUnverifiedHolehe determines whether an email address is registered by exploiting behavioral differences in websites' forgot-password and registration interfaces, rather than through brute force or credential stuffing.62% similarUnverifiedBy setting your own Message-ID and deriving it deterministically from the source event, you can turn your mailbox into a lookup table to determine whether an email has already been sent.62% similarUnverifiedFastmail can read user email content on the server side, which is the technical basis for providing features such as search, intelligent filtering, and calendar integration.62% similarUnverifiedEmail Health Check relies on Truelist's verification engine to perform real-time probing against actual mail servers, rather than judging address validity solely based on syntax rules or static databases61% similar
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