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• Have I Been Pwned — Search if an email appears in known data breaches
• DeHashed — Breach and credential search
• EmailRep.io — Email reputation and risk scoring
• Hunter.io — Discover corporate email patterns and addresses

• MX Toolbox — Email header analyzer and MX tools
• mailtester.com — Check if an email address is valid and deliverable
• VerifyEmail — Verify the validity of an email address

• urlscan.io — Sandbox and visualize web requests from a URL
• URLquery — Analyze suspicious URLs and detect malicious behavior
• PhishTank — Community-driven phishing URL database
• OpenPhish — Automated phishing feed
• StalkPhish — Identify phishing kits and reused infrastructures

• Maltiverse — IOC enrichment and threat intelligence search
• ThreatMiner — IOC and malware sample data mining