From: author :( 2001-11-2309: 08: 00) Step 2: forward the host to the target host R: 220BBN-VAX.ARPASimpleMailTransferServiceReadyS: HELOUSC-ISIE.ARPAR: 250BBN-VAX.ARPAS: MAILFROM: @ USC-ISIE.ARPA: JQP @ MIT-AI label: SMTP from: Author: (09:08:00)
Step 2: forward the host to the target host
R: 220 BBN-VAX.ARPA Simple Mail Transfer Service Ready
S: HELO USC-ISIE.ARPA
R: 250 BBN-VAX.ARPA
S: mail from: <@ USC-ISIE.ARPA: JQP@MIT-AI.ARPA>
R: 250 OK
S: rcpt:
R: 250 OK
S: DATA
R: 354 Start mail input; end .
S: Received: from MIT-AI.ARPA by USC-ISIE.ARPA;
2 Nov 81 22:40:10 UT
S: Date: 2 Nov 81 22:33:44
S: From: John Q. Public
S: Subject: The Next Meeting of the Board
S: To: Jones@BBN-Vax.ARPA
S:
S: Bill:
S: The next meeting of the board of directors will be
S: on Tuesday.
S: John.
S :.
R: 250 OK
S: QUIT
R: 221 USC-ISIE.ARPA Service closing transmission channel
Confirm and send
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
S: HELO MIT-MC.ARPA
R: 250 SU-SCORE.ARPA
S: VRFY cripin
R: 250 Mark cripin
S: send from:
R: 250 OK
S: rcpt:
R: 250 OK
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 SU-SCORE.ARPA Service closing transmission channel
To get and send an email, first determine the user name, and then try to send the email to the user terminal,
If it fails, it is sent to the user's mailbox.
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
S: HELO MIT-MC.ARPA
R: 250 SU-SCORE.ARPA
S: VRFY cripin
R: 250 Mark cripin
S: send from:
R: 250 OK
S: rcpt:
R: 450 User not active now
S: RSET
R: 250 OK
S: mail from:
R: 250 OK
S: rcpt:
R: 250 OK
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 SU-SCORE.ARPA Service closing transmission channel
A more effective approach to the above issues
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
S: HELO MIT-MC.ARPA
R: 250 SU-SCORE.ARPA
S: VRFY cripin
R: 250 Mark cripin
S: soml from:
R: 250 OK
S: rcpt:
R: 250 User not active now, so will do mail.
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 SU-SCORE.ARPA Service closing transmission channel
In the mail list, each of the two mail lists is extended on different sessions of different hosts,
Then, send an email to the user in the list by forwarding the host.
Step 1: expand the first list
R: 220 MIT-AI.ARPA Simple Mail Transfer Service Ready
S: HELO SU-SCORE.ARPA
R: 250 MIT-AI.ARPA
S: EXPN Example-People
R: 250-
R: 250-Fred Fonebone
R: 250-Xenon Y. Zither
R: 250-Quincy Smith <@ USC-ISIF.ARPA: Q-Smith@ISI-VAXA.ARPA>
R: 250-
R: 250
S: QUIT
R: 221 MIT-AI.ARPA Service closing transmission channel
Step 2: expand the second list
R: 220 MIT-MC.ARPA Simple Mail Transfer Service Ready
S: HELO SU-SCORE.ARPA
R: 250 MIT-MC.ARPA
S: EXPN Interested-Parties
R: 250-Al Calico
R: 250-
R: 250-Quincy Smith <@ USC-ISIF.ARPA: Q-Smith@ISI-VAXA.ARPA>
R: 250-
R: 250
S: QUIT
R: 221 MIT-MC.ARPA Service closing transmission channel
Step 3: send emails to all users in the two lists through the forwarding host
R: 220 USC-ISIE.ARPA Simple Mail Transfer Service Ready
S: HELO SU-SCORE.ARPA
R: 250 USC-ISIE.ARPA
S: mail from:
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: ABC@MIT-MC.ARPA>
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: Fonebone@USC-ISIQA.ARPA>
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: XYZ@MIT-AI.ARPA>
R: 250 OK
S: RCPT
TO: <@ USC-ISIE.ARPA, @ USC-ISIF.ARPA: Q-Smith@ISI-VAXA.ARPA>
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: joe@FOO-UNIX.ARPA>
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: xyz@BAR-UNIX.ARPA>
R: 250 OK
S: rcpt to: <@ USC-ISIE.ARPA: fred@BBN-UNIX.ARPA>
R: 250 OK
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 USC-ISIE.ARPA Service closing transmission channel
Forwarding status
R: 220 USC-ISIF.ARPA Simple Mail Transfer Service Ready
S: HELO LBL-UNIX.ARPA
R: 250 USC-ISIF.ARPA
S: mail from:
R: 250 OK
S: rcpt:
R: 251 User not local; will forward
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 USC-ISIF.ARPA Service closing transmission channel
Step 1: try the mailbox on the first host
R: 220 USC-ISIF.ARPA Simple Mail Transfer Service Ready
S: HELO LBL-UNIX.ARPA
R: 250 USC-ISIF.ARPA
S: mail from:
R: 250 OK
S: rcpt:
R: 251 User not local; will forward
S: RSET
R: 250 OK
S: QUIT
R: 221 USC-ISIF.ARPA Service closing transmission channel
Step 2: try the mailbox on the second host
R: 220 USC-ISI.ARPA Simple Mail Transfer Service Ready
S: HELO LBL-UNIX.ARPA
R: 250 USC-ISI.ARPA
S: mail from:
R: 250 OK
S: rcpt:
R: OK
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 USC-ISI.ARPA Service closing transmission channel
Many recipients
R: 220 BERKELEY. ARPA Simple Mail Transfer Service Ready
S: HELO USC-ISIF.ARPA
R: 250 BERKELEY. ARPA
S: mail from:
R: 250 OK
S: rcpt:
R: 250 OK
S: rcpt:
R: 552 Recipient storage full, try again in another transaction
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: mail from:
R: 250 OK
S: rcpt:
R: 250 OK
S: DATA
R: 354 Start mail input; end .
S: Blah blah...
S:... etc. etc.
S :.
R: 250 OK
S: QUIT
R: 221 BERKELEY. ARPA Service closing transmission channel
Glossary:
Enter
Space
ASCII
US standard information Interchange Code
Host
Network Computer with SMTP process or mailbox
Send SMTP process
Processes that work with the receiving SMTP process. Send SMTP to start the transmission service connection, it sends
SMTP commands, receive responses, and manage mail delivery
User
The person who wants to get the mail service (or the process that appears in the name of a person), or the recipient of the mail.
Session
A series of information exchanges when the transmission channel is enabled
Transmission Service
Reliable stream-oriented data communication service. For example, NCP, TCP, and NITS.
Transmission channel
A full-duplex channel established between sending SMTP and receiving SMTP for command exchange, response, and mail content
Character
Printable string
Line
Take Ended email content
Response
Receiving SMTP-to-SMTP messages sent through the transmission channel to a certain command (successful or unsuccessful)
Response. The common format of the response is the response code and a text segment. Generally, the response code is used by the machine,
Text is used by human users.
Email content
A series of strings that comply with the standard character set of ARPA Internet text information format
Mail content end mark
The specified character indicating the end of the email content
Email
Specifies the address (string) of the mail to which the user should be sent ). It is usually represented by the user name and host name
Command
Requests sent by sending SMTP to receive SMTP that require one mail service operation
Domain
Hierarchical representation of host address strings in the mail system
Receiving SMTP process
The process that works with the SMTP sending process. It is waiting for a connection established through the transmission service. It receives and sends
The commands issued by SMTP give a response and execute the corresponding operations
Operation
A series of operations that a message is sent from one receiver to another or multiple receivers.
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