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American Standard Code for Information Interchange .
A request for a mail service action sent by the sender-SMTP to the
The hierarchially structured global character string address of a
host computer in the mail system.
end of mail data indication
A special sequence of characters that indicates the end of the
mail data. In particular, the five characters carriage return,
line feed, period, carriage return, line feed, in that order.
A computer in the internetwork environment on which mailboxes or
SMTP processes reside.
A a sequence of ASCII characters ending with a <CRLF>.
A sequence of ASCII characters of arbitrary length, which conforms
to the standard set in the Standard for the Format of ARPA
Internet Text Messages (RFC 822 ).
A character string (address) which identifies a user to whom mail
is to be sent. Mailbox normally consists of the host and user
specifications. The standard mailbox naming convention is defined
to be "user@domain". Additionally, the "container" in which mail
A process which transfers mail in cooperation with a sender-SMTP
process. It waits for a connection to be established via the
transport service. It receives SMTP commands from the
sender-SMTP, sends replies, and performs the specified operations.
A reply is an acknowledgment (positive or negative) sent from
receiver to sender via the transmission channel in response to a
command. The general form of a reply is a completion code
(including error codes) followed by a text string. The codes are
for use by programs and the text is usually intended for human
A process which transfers mail in cooperation with a receiver-SMTP
process. A local language may be used in the user interface
command/reply dialogue. The sender-SMTP initiates the transport
service connection. It initiates SMTP commands, receives replies,
and governs the transfer of mail.
The set of exchanges that occur while the transmission channel is
The set of exchanges required for one message to be transmitted
for one or more recipients.
A full-duplex communication path between a sender-SMTP and a
receiver-SMTP for the exchange of commands, replies, and mail
Any reliable stream-oriented data communication services. For
example, NCP, TCP, NITS.
A human being (or a process on behalf of a human being) wishing to
obtain mail transfer service. In addition, a recipient of
A sequence of printing characters.
The characters carriage return and line feed (in that order).
The space character.