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  2. Message authentication code - Wikipedia

    en.wikipedia.org/wiki/Message_authentication_code

    Message authentication code. In cryptography, a message authentication code ( MAC ), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity -checking a message. In other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity).

  3. Macintosh startup - Wikipedia

    en.wikipedia.org/wiki/Macintosh_startup

    The classic Macintosh startup sequence includes hardware tests which may trigger the startup chimes, Happy Mac, Sad Mac, and Chimes of Death.. All Macs made from 2016 to 2020 have the startup chimes disabled by default, however it would later be re-enabled on those Macs running macOS Big Sur or later; this can be disabled by the user within System Preferences (Big Sur up to Monterey) or System ...

  4. Fix problems reading or receiving AOL Mail - AOL Help

    help.aol.com/articles/fix-problems-reading-or...

    Call paid premium support at 1-800-358-4860 to get live expert help from AOL Customer Care. Find out how to fix problems reading or receiving AOL Mail.

  5. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  6. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.

  7. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    There are two different protocols you can choose when setting up a third-party email app: POP or IMAP. POP downloads a copy of your emails from your account (mail.aol.com) to the app. This means that if you delete an email from your account after it's been downloaded, the downloaded copy remains in the app. Additionally, POP only downloads ...

  8. List of FTP server return codes - Wikipedia

    en.wikipedia.org/.../List_of_FTP_server_return_codes

    List of FTP server return codes. FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range. Purpose. 1xx. Positive Preliminary reply. The requested action is being initiated; expect another reply before proceeding with a new command.

  9. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!