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  2. List of SMTP server return codes - Wikipedia

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

    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 server capable of replying with an Enhanced Status ...

  3. Microsoft Exchange Server - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Exchange_Server

    Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems. The first version was called Exchange Server 4.0, to position it as the successor to the related Microsoft Mail 3.5. Exchange initially used the X.400 directory service but switched to Active ...

  4. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    1xx—Provisional Responses. 100 Trying. Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [1]: §21.1.1. 180 Ringing. Destination user agent received INVITE, and is alerting user of call. [1]: §21.1.2. 181 Call is Being Forwarded.

  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. History of Microsoft Exchange Server - Wikipedia

    en.wikipedia.org/wiki/History_of_Microsoft...

    Initial release: May 23, 1997. Introduced the new Exchange Administrator console, as well as opening up "integrated" access to SMTP-based networks for the first time.. Unlike Microsoft Mail (which required a standalone SMTP relay), Exchange Server 5.0 could, with the help of an add-in called the Internet Mail Connector, communicate directly with servers using

  7. 2021 Microsoft Exchange Server data breach - Wikipedia

    en.wikipedia.org/wiki/2021_Microsoft_Exchange...

    The first breach of a Microsoft Exchange Server instance was observed by cybersecurity company Volexity on 6 January 2021. [1] By the end of January, Volexity had observed a breach allowing attackers to spy on two of their customers, and alerted Microsoft to the vulnerability. After Microsoft was alerted of the breach, Volexity noted the ...

  8. IEC 60870-6 - Wikipedia

    en.wikipedia.org/wiki/IEC_60870-6

    IEC 60870 part 6 in electrical engineering and power system automation, is one of the IEC 60870 set of standards which define systems used for telecontrol (supervisory control and data acquisition) in electrical engineering and power system automation applications. The IEC Technical Committee 57 (Working Group 03) have developed part 6 to ...

  9. Exchange Online Protection - Wikipedia

    en.wikipedia.org/wiki/Exchange_Online_Protection

    Exchange Online Protection (EOP, formerly Forefront Online Protection for Exchange or FOPE) [1] [2] is a hosted e-mail security service, owned by Microsoft, that filters spam and removes computer viruses from e-mail messages. [3]