rfc821(c).txt

计算机网络的课件Courseware for computer networks

S: QUIT

R: 221 MIT-Multics.ARPA Service closing transmission channel

转发邮件 

第一步：源主机到转发主机

R: 220 USC-ISIE.ARPA Simple Mail Transfer Service Ready

S: HELO MIT-AI.ARPA

R: 250 USC-ISIE.ARPA

　

S: MAIL FROM:<[e-mail]>

R: 250 OK

S: RCPT TO:<@USC-ISIE.ARPA:[e-mail]>

R: 250 OK

S: DATA

R: 354 Start mail input; end with <CRLF>.<CRLF>

S: Date: 2 Nov 81 22:33:44

S: From: John Q. Public <[e-mail]>

S: Subject: The Next Meeting of the Board

S: To: [e-mail]

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

第二步：转发主机到目的主机

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:[e-mail]>

R: 250 OK

S: RCPT TO:<[e-mail]>

R: 250 OK

S: DATA

R: 354 Start mail input; end with <CRLF>.<CRLF>

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 <[e-mail]>

S: Subject: The Next Meeting of the Board

S: To: [e-mail]

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
确认和发送

R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready

S: HELO MIT-MC.ARPA

R: 250 SU-SCORE.ARPA

S: VRFY Crispin

R: 250 Mark Crispin <[e-mail]>

S: SEND FROM:<[e-mail]>

R: 250 OK

S: RCPT TO:<[e-mail]>

R: 250 OK
S: DATA

R: 354 Start mail input; end with <CRLF>.<CRLF>

S: Blah blah blah...

S: ...etc. etc. etc.

S: .

R: 250 OK

S: QUIT

R: 221 SU-SCORE.ARPA Service closing transmission channel

获得和发送邮件 首先确定用户名，然后尝试将邮件发送到用户终端，当它失败时，发送到用户邮箱。

R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready

S: HELO MIT-MC.ARPA

R: 250 SU-SCORE.ARPA

　

S: VRFY Crispin

R: 250 Mark Crispin <[e-mail]>

S: SEND FROM:<[e-mail]>

R: 250 OK
S: RCPT TO:<[e-mail]>

R: 450 User not active now

S: RSET

R: 250 OK

S: MAIL FROM:<[e-mail]>

R: 250 OK

S: RCPT TO:<[e-mail]>

R: 250 OK

S: DATA

R: 354 Start mail input; end with <CRLF>.<CRLF>

S: Blah blah blah...

S: ...etc. etc. etc.

S: .

R: 250 OK

S: QUIT

R: 221 SU-SCORE.ARPA Service closing transmission channel

上述问题的更有效的作法 

R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready

S: HELO MIT-MC.ARPA

R: 250 SU-SCORE.ARPA
S: VRFY Crispin

R: 250 Mark Crispin <[e-mail]>

S: SOML FROM:<[e-mail]>

R: 250 OK

S: RCPT TO:<[e-mail]>

R: 250 User not active now, so will do mail.

S: DATA

R: 354 Start mail input; end with <CRLF>.<CRLF>

S: Blah blah blah...

S: ...etc. etc. etc.

S: .

R: 250 OK

S: QUIT

R: 221 SU-SCORE.ARPA Service closing transmission channel

　　邮件列表 首先，两个邮件列表中的每一个在不同主机的不同会话上扩展，然后，通过转发主机向列表上的用户发送邮件。

第一步：扩展第一个列表

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-<[e-mail]>

R: 250-Fred Fonebone <[e-mail]>

R: 250-Xenon Y. Zither <[e-mail]>

R: 250-Quincy Smith <@USC-ISIF.ARPA:[e-mail]>

R: 250-<[e-mail]>

R: 250 <[e-mail]>

S: QUIT

R: 221 MIT-AI.ARPA Service closing transmission channel
　
第二步：扩展第二个列表 

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 <[e-mail]>

R: 250-<[e-mail]>

R: 250-Quincy Smith <@USC-ISIF.ARPA:[e-mail]>

R: 250-<[e-mail]>

R: 250 <[e-mail]>

S: QUIT

R: 221 MIT-MC.ARPA Service closing transmission channel

　

第三步：通过转发主机向包括于两个列表中的所有用户发送邮件 

R: 220 USC-ISIE.ARPA Simple Mail Transfer Service Ready

S: HELO SU-SCORE.ARPA

R: 250 USC-ISIE.ARPA

S: MAIL FROM:<[e-mail]>

R: 250 OK

S: RCPT TO:<@USC-ISIE.ARPA:[e-mail]>

R: 250 OK

S: RCPT TO:<@USC-ISIE.ARPA:[e-mail]>

R: 250 OK

S: RCPT TO:<@USC-ISIE.ARPA:[e-mail]>

R: 250 OK

S: RCPT

TO:<@USC-ISIE.ARPA,@USC-ISIF.ARPA:[e-mail]>