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2. Email authentication - Wikipedia

   en.wikipedia.org/wiki/Email_authentication

   Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message.

3. DomainKeys Identified Mail - Wikipedia

   en.wikipedia.org/wiki/DomainKeys_Identified_Mail

   DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [ 1 ]

4. WHOIS - Wikipedia

   en.wikipedia.org/wiki/WHOIS

   Currently, the Internet Corporation for Assigned Names and Numbers broadly requires that the mailing address, phone number and e-mail address of those owning or administering a domain name to be made publicly available through the "WHOIS" directories. The registrant's (domain owner's) contact details, such as address and telephone number, are ...

5. What's a six-digit verification code — and why you should ...

   www.aol.com/whats-six-digit-verification-code...

   Six-digit verification codes are a form of two-factor authentication, a process that helps keep your important online accounts secure. For example, you might get a text message or email with a six ...

6. Use AOL Official Mail to confirm legitimate AOL emails

   help.aol.com/articles/what-is-official-aol-mail

   If you get a message that seems like it's from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Certified Mail, it might be a fake email. Make sure you immediately mark it as spam and don't click on any links in the email.

7. Use AOL Certified Mail to confirm legitimate AOL emails

   help.aol.com/articles/what-is-aol-certified-mail

   When you open the email, you'll also see the Certified Mail banner above the message details. When you get a message that seems to be from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Official Mail, it might be a fake email. Make sure you mark it as spam and don't click on any links in the email.