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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 .
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 ...
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 ...
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.
increased shortness of breath. swelling in the ankles, legs, abdomen, or other parts of your body. fatigue. chest discomfort. sudden weight gain. reduced exercise tolerance. persistent cough or ...
Hotline tracker server connection 5499: Unofficial: Hotline tracker server discovery 5500 Unofficial: Hotline control connection Unofficial: VNC Remote Frame Buffer RFB protocol—for incoming listening viewer 5501: Unofficial: Hotline file transfer connection 5517: Unofficial: Setiqueue Proxy server client for SETI@Home project 5550: Unofficial
Pain above the knee. Pain above your knee can be caused by: Quadricep or hamstring tendinitis: Tendinitis happens when the tendons that attach muscles to your bones ( quadriceps and hamstrings ...
A message transfer agent receives mail from either another MTA, a mail submission agent (MSA), or a mail user agent (MUA). The transmission details are specified by the Simple Mail Transfer Protocol (SMTP). When a recipient mailbox of a message is not hosted locally, the message is relayed, that is, forwarded to another MTA.