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  2. 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.

  3. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

  4. X.400 - Wikipedia

    en.wikipedia.org/wiki/X.400

    An X.400 address is technically referred to as an Originator/Recipient (OR) address. It has two purposes: Mailbox identification – either the originator or recipient. Global domain identification – where a given mailbox is located. 1984 defined an OR address as an X.400 address that identified where the user is located.

  5. Outlook on the web - Wikipedia

    en.wikipedia.org/wiki/Outlook_on_the_web

    Website. microsoft .com /microsoft-365 /outlook /web-email-login-for-outlook. Outlook on the web (formerly Outlook Web App and Outlook Web Access [2]) is a personal information manager web app from Microsoft. It is a web-based version of Microsoft Outlook, and is included in Exchange Server and Exchange Online (a component of Microsoft 365 .)

  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. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing ...

  8. Microsoft Outlook - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Outlook

    Microsoft Outlook is a part of Office Suite that can be used as a standalone application. It helps you to access Microsoft Exchange Server email. Additionally, it provides contacts, calendaring, and task management functionality. This advanced email application is widely used for business purposes.

  9. X.500 - Wikipedia

    en.wikipedia.org/wiki/X.500

    X.500. X.500 is a series of computer networking standards covering electronic directory services. The X.500 series was developed by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T). ITU-T was formerly known as the Consultative Committee for International Telephony and Telegraphy (CCITT).