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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
In contrast, one-way computer communication, which is like the push-to-talk or "barge in" feature found on some phones and two-way radios, sends a message without waiting for a response. Sending an email is an example of one-way communication, and another example are fieldbus sensors, such as most CAN bus sensors, which periodically and ...
The recipient is informed that they should reply to this email. RSVP, meaning Reply Requested, please, from the French Répondez s'il vous plaît. The recipient is informed that they should reply to this email. Often used for replies (accept/decline) to invitations. SFW, meaning Safe For Work. Used in corporate emails to indicate that although ...
The initiating host, the SMTP client, can be either an end-user's email client, functionally identified as a mail user agent (MUA), or a relay server's mail transfer agent (MTA), that is an SMTP server acting as an SMTP client, in the relevant session, in order to relay mail. Fully capable SMTP servers maintain queues of messages for retrying ...
The term message exchange pattern has an extended meaning within the Simple Object Access protocol . [2] [3] SOAP MEP types include: In-Only: This is equivalent to one-way. A standard one-way messaging exchange where the consumer sends a message to the provider that provides do not send any type of response.
Each response header field has a defined meaning which can be further refined by the semantics of the request method or response status code. HTTP/1.1 example of request / response transaction Below is a sample HTTP transaction between an HTTP/1.1 client and an HTTP/1.1 server running on www.example.com , port 80.
The client only has to understand the response based on the relevant application protocol, i.e. the content and the formatting of the data for the requested service. Clients and servers exchange messages in a request–response messaging pattern. The client sends a request, and the server returns a response.
It, however, is only defined for the request header. Its meaning in a response header is not specified. [77] The behavior of Pragma: no-cache in a response is implementation specific. While some user agents do pay attention to this field in responses, [78] the HTTP/1.1 RFC specifically warns against relying on this behavior.