what-an-email-reveals
From the author
Investigate an email address — MX and syntactic validation, Gravatar lookup, corporate email-format inference, breach exposure, and full mail-header analysis covering the Received chain, Message-ID and SPF, DKIM and DMARC results. Use for email OSINT, verifying whether an address exists, finding accounts registered to it, guessing a company's email format, or tracing where a suspicious message actually came from. Applies to business email compromise and invoice-fraud investigation, phishing triage, vendor-payment verification, and pre-engagement research. Reference at useosint.com/skills/what-an-email-reveals.
Install
npx skills add UseOSINT/Skills --skill what-an-email-reveals -a claude-code
Installs to .claude/skills/what-an-email-reveals/ · Each command fetches the skill straight from GitHub with the open skills CLI.
Byte-identical to the scanned commit, with the repository’s licence and a SOURCE.txt.
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Why 80
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