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</span></span>

</span></span>
Replaces: RFC 788, 780, 772 August 1982
</span>
(RFC821 SIMPLE MAIL TRANSFER PROTOCOL)
</span></span>
36
</span></span>

</span></span>

</span></span>
MAIL <SP> FROM:<reverse-path> <CRLF>
</span></span>

</span></span>

</span></span>
RCPT <SP> TO:<forward-path> <CRLF>
</span></span>

</span></span>

</span></span>
DATA <CRLF>
</span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>
<forward-path>
</span></span>

</span></span>

</span></span>
R: 553 User ambiguous.
</span></span>
R: 550 Access Denied to You.
</span></span>

</span></span>
R: 250 BBN-UNIX.ARPA
</span></span>
MAIL FROM:<>
</span></span>

</span></span>
To: SAM@JKL.ARPA
</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>
TURN <CRLF>
</span></span>
> ::= "JAN" | "FEB" | "MAR" | "APR" | "MAY" | "JUN" | "JUL" | "AUG" | "SEP" | "OCT" | "NOV" |
</span></span>

</span></span>
+---+
</span>
4,5
</span></span>

</span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>
123-First line
</span>
123-Second line
</span>
123-234 text beginning with numbers
</span>
123 The last line
</span>

</span></span>

</span></span>

</span></span>

</span></span>
R: 220 BBN-UNIX.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO USC-ISIF.ARPA
</span>
R: 250 BBN-UNIX.ARPA
</span>
S: MAIL FROM:<Smith@USC-ISIF.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Jones@BBN-UNIX.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Green@BBN-UNIX.ARPA>
</span>
R: 550 No such user here
</span>
S: RCPT TO:<Brown@BBN-UNIX.ARPA>
</span>
R: 250 OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 BBN-UNIX.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 MIT-Multics.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO ISI-VAXA.ARPA R: 250 MIT-Multics.ARPA
</span>
S: MAIL FROM:<Smith@ISI-VAXA.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Jones@MIT-Multics.ARPA>
</span>
S: RCPT TO:<Green@MIT-Multics.ARPA>
</span></span>
R: 550 No such user here
</span>
S: RSET
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 MIT-Multics.ARPA Service closing transmission channel
</span>

</span></span>

</span></span>
R: 220 USC-ISIE.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO MIT-AI.ARPA
</span>
R: 250 USC-ISIE.ARPA
</span>

</span></span>
S: MAIL FROM:<JQP@MIT-AI.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:Jones@BBN-VAX.ARPA>
</span>
R: 250 OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Date: 2 Nov 81 22:33:44
</span>
S: From: John Q. Public <JQP@MIT-AI.ARPA>
</span>
S: Subject: The Next Meeting of the Board
</span>
S: To: Jones@BBN-Vax.ARPA
</span>
S:
</span>
S: Bill:
</span>
S: The next meeting of the board of directors will be
</span>
S: on Tuesday.
</span>
S: John.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 USC-ISIE.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 BBN-VAX.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO USC-ISIE.ARPA
</span>
R: 250 BBN-VAX.ARPA
</span>
S: MAIL FROM:<@USC-ISIE.ARPA:JQP@MIT-AI.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Jones@BBN-VAX.ARPA>
</span>
R: 250 OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Received: from MIT-AI.ARPA by USC-ISIE.ARPA ;
</span>
2 Nov 81 22:40:10 UT
</span>
S: Date: 2 Nov 81 22:33:44
</span>
S: From: John Q. Public <JQP@MIT-AI.ARPA>
</span>
S: Subject: The Next Meeting of the Board
</span>
S: To: Jones@BBN-Vax.ARPA
</span>
S:
</span>
S: Bill:
</span>
S: The next meeting of the board of directors will be
</span>
S: on Tuesday.
</span>
S: John.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>

</span></span>
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO MIT-MC.ARPA
</span>
R: 250 SU-SCORE.ARPA
</span>
S: VRFY Crispin
</span>
R: 250 Mark Crispin <Admin.MRC@SU-SCORE.ARPA>
</span>
S: SEND FROM:<EAK@MIT-MC.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Admin.MRC@SU-SCORE.ARPA>
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 SU-SCORE.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO MIT-MC.ARPA
</span>
R: 250 SU-SCORE.ARPA
</span>

</span></span>
S: VRFY Crispin
</span>
R: 250 Mark Crispin <Admin.MRC@SU-SCORE.ARPA>
</span>
S: SEND FROM:<EAK@MIT-MC.ARPA>
</span>
S: RCPT TO:<Admin.MRC@SU-SCORE.ARPA>
</span>
R: 450 User not active now
</span>
S: RSET
</span>
R: 250 OK
</span>
S: MAIL FROM:<EAK@MIT-MC.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Admin.MRC@SU-SCORE.ARPA>
</span>
R: 250 OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 SU-SCORE.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 SU-SCORE.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO MIT-MC.ARPA
</span>
S: VRFY Crispin
</span>
R: 250 Mark Crispin <Admin.MRC@SU-SCORE.ARPA>
</span>
S: SOML FROM:<EAK@MIT-MC.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<Admin.MRC@SU-SCORE.ARPA>
</span>
R: 250 User not active now, so will do mail.
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 SU-SCORE.ARPA Service closing transmission channel
</span>

</span></span>

</span></span>
R: 220 MIT-AI.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO SU-SCORE.ARPA
</span>
R: 250 MIT-AI.ARPA
</span>

</span></span>
S: EXPN Example-People
</span>
R: 250-<ABC@MIT-MC.ARPA>
</span>
R: 250-Fred Fonebone <Fonebone@USC-ISIQ.ARPA>
</span>
R: 250-Xenon Y. Zither <XYZ@MIT-AI.ARPA>
</span>
R: 250-Quincy Smith <@USC-ISIF.ARPA:Q-Smith@ISI-VAXA.ARPA>
</span>
R: 250-<joe@foo-unix.ARPA>
</span>
R: 250 <xyz@bar-unix.ARPA>
</span>
S: QUIT
</span>

</span></span>
R: 220 MIT-MC.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO SU-SCORE.ARPA
</span>
R: 250 MIT-MC.ARPA
</span>
S: EXPN Interested-Parties
</span>
R: 250-Al Calico <ABC@MIT-MC.ARPA>
</span>
R: 250-<XYZ@MIT-AI.ARPA>
</span>
R: 250-Quincy Smith <@USC-ISIF.ARPA:Q-Smith@ISI-VAXA.ARPA>
</span>
R: 250-<fred@BBN-UNIX.ARPA>
</span>
R: 250 <xyz@bar-unix.ARPA>
</span>
S: QUIT
</span>
R: 221 MIT-MC.ARPA Service closing transmission channel
</span>

</span></span>

</span></span>
R: 220 USC-ISIE.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO SU-SCORE.ARPA
</span>
R: 250 USC-ISIE.ARPA
</span>
S: MAIL FROM:<Account.Person@SU-SCORE.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:ABC@MIT-MC.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:Fonebone@USC-ISIQA.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:XYZ@MIT-AI.ARPA>
</span>
R: 250 OK
</span>
S: RCPT
</span>
TO:<@USC-ISIE.ARPA,@USC-ISIF.ARPA:Q-Smith@ISI-VAXA.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:joe@FOO-UNIX.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:xyz@BAR-UNIX.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<@USC-ISIE.ARPA:fred@BBN-UNIX.ARPA>
</span>
R: 250 OK
</span>

</span></span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 USC-ISIE.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 USC-ISIF.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO LBL-UNIX.ARPA
</span>
R: 250 USC-ISIF.ARPA
</span>
S: MAIL FROM:<mo@LBL-UNIX.ARPA>
</span>
S: RCPT TO:<fred@USC-ISIF.ARPA>
</span></span>
R: 251 User not local; will forward to <Jones@USC-ISI.ARPA>
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
S: QUIT
</span>
R: 221 USC-ISIF.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 USC-ISIF.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO LBL-UNIX.ARPA
</span>
R: 250 USC-ISIF.ARPA
</span>
S: MAIL FROM:<mo@LBL-UNIX.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<fred@USC-ISIF.ARPA>
</span>
S: RSET
</span></span>
S: QUIT
</span></span>
R: 221 USC-ISIF.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 USC-ISI.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO LBL-UNIX.ARPA
</span>
R: 250 USC-ISI.ARPA
</span>
S: MAIL FROM:<mo@LBL-UNIX.ARPA>
</span>
S: RCPT TO:<Jones@USC-ISI.ARPA>
</span></span>
R: OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
S: QUIT
</span></span>
R: 221 USC-ISI.ARPA Service closing transmission channel
</span>

</span></span>
R: 220 BERKELEY.ARPA Simple Mail Transfer Service Ready
</span>
S: HELO USC-ISIF.ARPA
</span>
S: MAIL FROM:<Postel@USC-ISIF.ARPA>
</span></span>
S: RCPT TO:<fabry@BERKELEY.ARPA>
</span></span>
R: 250 OK
</span>
S: RCPT TO:<eric@BERKELEY.ARPA>
</span>
S: DATA
</span></span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: .
</span>
R: 250 OK
</span>

</span></span>
S: MAIL FROM:<Postel@USC-ISIF.ARPA>
</span>
R: 250 OK
</span>
S: RCPT TO:<eric@BERKELEY.ARPA>
</span>
R: 250 OK
</span>
S: DATA
</span>
R: 354 Start mail input; end with <CRLF>.<CRLF>
</span>
S: Blah blah blah...
</span>
S: ...etc. etc. etc.
</span>
S: .
</span>
R: 250 OK
</span>
S: QUIT
</span>
R: 221 BERKELEY.ARPA Service closing transmission channel
</span>
:
</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>

</span></span>
[1] ASCII
</span></span>
Park, California, Revised January 1978.
</span>
[2] RFC 822
</span>
<place w:st="on"><placetype w:st="on">University</placetype> of <placename w:st="on">Delaware</placename></place>, August 1982.
</span>
[3] TCP
</span>
Workbook", SRI International, <place w:st="on"><city w:st="on">Menlo Park</city>, <state w:st="on">California</state></place>, March 1982.
</span>
[4] NCP
</span>
January 1978.
</span>
[5] Initial Connection Protocol
</span>
January 1978.
</span>
[6] NITS
</span>
the DCPU, National Physical Laboratory, <place w:st="on"><city w:st="on">Teddington</city>, <country-region w:st="on">UK</country-region></place>.
</span>
Simple Mail Transfer Protocol
</span>
[7] X.25
</span>
Telegraph Consultative Committee, Geneva, 1976.
</span>

</span></span>

</span>
 
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