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Message transfer can occur in a single connection between two MTAs, or in a series of hops through intermediary systems. A receiving SMTP server may be the ultimate destination, an intermediate "relay" (that is, it stores and forwards the message) or a "gateway" (that is, it may forward the message using some protocol other than SMTP).
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.
Examples of protocols that use plain, human-readable text for its commands are FTP (File Transfer Protocol), SMTP (Simple Mail Transfer Protocol), early versions of HTTP (Hypertext Transfer Protocol), and the finger protocol. [36]
For example, FTP is a user protocol and DNS is a support protocol. Although the applications are usually aware of key qualities of the transport layer connection such as the endpoint IP addresses and port numbers, application layer protocols generally treat the transport layer (and lower) protocols as black boxes which provide a stable network ...
An example is the handshaking between a ... The Simple Mail Transfer Protocol ... or an alert message (as specified below). The protocol is used to negotiate the ...
Asynchronous message relaying Transport Layer Security End-to-end encryption Unlimited number of contacts Bulletins to all contacts One-to-many routing [a] Spam protection Group, channel or conference support Audio/VoIP support Webcam/Video Batch file sharing Media synchronization Serverless [b] Binary format Protocol; 3GPP standards: Friedhelm ...
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A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified in RFC 6409. [1]