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  2. Challenge–response spam filtering - Wikipedia

    en.wikipedia.org/wiki/Challenge–response_spam...

    A challenge that includes a web URL, which can be loaded in an appropriate web browsing tool to respond to the challenge, so simply clicking on the link is sufficient to respond to the challenge. A challenge requiring reading natural language instructions on how to reply, with the inclusion of a special string or pass-code in the reply.

  3. Fix issues with AOL Mail image challenges - AOL Help

    help.aol.com/articles/what-should-i-do-if-i-get...

    If you've just passed an image challenge, but are immediately prompted by another, there may be an issue with your browser. Before you attempt another image challenge, clear the cache on your web browser. If you're still prompted to retake the image challenge multiple times a day, you might have a more serious issue.

  4. 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.

  5. DMARC - Wikipedia

    en.wikipedia.org/wiki/DMARC

    The purpose and primary outcome of implementing DMARC is to protect a domain from being used in business email compromise attacks, phishing email and email scams. Once the DMARC DNS entry is published, any receiving email server can authenticate the incoming email based on the instructions published by the domain owner within the DNS entry. If ...

  6. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  7. Find and remove unusual activity on your AOL account

    help.aol.com/articles/find-and-remove-unusual...

    Depending on how you access your account, there can be up to 3 sections. If you see something you don't recognize, click Sign out or Remove next to it, then immediately change your password. • Recent activity - Devices or browsers that recently signed in. • Apps connected to your account - Apps you've given permission to access your info.

  8. Email spoofing - Wikipedia

    en.wikipedia.org/wiki/Email_spoofing

    Email spoofing is the creation of email messages with a forged sender address. [1] The term applies to email purporting to be from an address which is not actually the sender's; mail sent in reply to that address may bounce or be delivered to an unrelated party whose identity has been faked.

  9. Salted Challenge Response Authentication Mechanism - Wikipedia

    en.wikipedia.org/wiki/Salted_Challenge_Response...

    RFC 5802, Salted Challenge Response Authentication Mechanism (SCRAM) SASL and GSS-API Mechanisms; RFC 5803, Lightweight Directory Access Protocol (LDAP) Schema for Storing Salted Challenge Response Authentication Mechanism (SCRAM) Secrets; RFC 6120, Extensible Messaging and Presence Protocol (XMPP): Core; RFC 6331, Moving DIGEST-MD5 to Historic