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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 was later 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. 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.

5. Bomb (icon) - Wikipedia

   en.wikipedia.org/wiki/Bomb_(icon)

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

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. AOL Mail - AOL Help

   help.aol.com/products/new-aol-mail

   Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

8. Fix problems signing into your AOL account - AOL Help

   qa.help.aol.com/articles/help-signing-in

   Enter your username and password. Click Sign in. If that doesn't fix the problem, try these steps and attempt to sign in after each one: Clear your browser's cookies. Quit and then restart your browser. Use a different supported web browser. Try signing into a different sign-in page, like our Aol.com sign-in page or the AOL Mail sign-in page.

9. List of SMTP server return codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SMTP_server_return...

   X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .