Check the email domain for clues about the provider, company, or organization
Search the full email address in search engines
Search the username part of the email on social media platforms
Look up the domain’s WHOIS records if it is a personal or custom domain
Check professional networks such as LinkedIn for the email username or associated name
Search data breach lookup services to see where the email may have appeared
Review public profiles, forums, or websites where the email may be listed
Use reverse email lookup services
Send a polite email asking the person to identify themselves
If the email is from a business, contact the company through official channels
Check email headers if you received a message from that address to identify the sending server or organization
Use people-search tools only in compliance with privacy laws and platform terms