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  2. List of security hacking incidents - Wikipedia

    en.wikipedia.org/wiki/List_of_security_hacking...

    1980. The FBI investigates a breach of security at National CSS (NCSS). The New York Times, reporting on the incident in 1981, describes hackers as; technical experts, skilled, often young, computer programmers who almost whimsically probe the defenses of a computer system, searching out the limits and the possibilities of the machine.

  3. List of SMTP server return codes - Wikipedia

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

    X.1.XXX Addressing Status. 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 . A ...

  4. Yahoo! Mail - Wikipedia

    en.wikipedia.org/wiki/Yahoo!_Mail

    Online. Content license. Proprietary. Yahoo! Mail (also written as Yahoo Mail) is an email service offered by the American company Yahoo, Inc. The service is free for personal use, with an optional monthly fee for additional features. Business email was previously available with the Yahoo! Small Business brand, before it transitioned to Verizon ...

  5. Why am I asked to verify my account after signing in?

    help.aol.com/articles/why-am-i-asked-to-verify...

    If there's something unusual about your sign in or recent activity, we'll ask you to go through another verification step after you've entered the correct password.

  6. Package tracking - Wikipedia

    en.wikipedia.org/wiki/Package_tracking

    Package tracking. Package tracking or package logging is the process of localizing shipping containers, mail and parcel post at different points of time during sorting, warehousing, and package delivery to verify their provenance and to predict and aid delivery. Package tracking developed historically because it provided customers information ...

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

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

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure.

  8. Fix problems sending AOL Mail - AOL Help

    help.aol.com/articles/aol-mail-troubleshooting

    Call paid premium support at 1-800-358-4860 to get live expert help from AOL Customer Care. Learn how to fix problems with sending mail.

  9. List of Boeing customer codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Boeing_customer_codes

    The codes are in the form of two letters and/or digits which are appended to the aircraft's model designator, as seen in the following examples: A Boeing 707-100 ordered by Qantas with customer code 38 would be designated as 707-138. A Boeing 717 ordered by Hawaiian Airlines with customer code 2A would be designated as 717-22A.