rfc1891.txt

用C#开发实现SMTP相关技术,能接收到带附件的邮件服务功能.

>>> (message goes here)
>>> .
<<< 250 message received
>>> QUIT
<<< 221 bye

   Note that since the Ivory.EDU refused to accept mail for
   [e-mail], and the sender specified NOTIFY=FAILURE, the
   sender-SMTP (in this case Pure-Heart.ORG) must generate a DSN.

10.4 Relay to Bombs.AF.MIL

   The SMTP at Pure-Heart.ORG relays the message to Bombs.AF.MIL, which
   does not support the SMTP extension.  Because the sender specified
   NOTIFY=NEVER for recipient [e-mail], the SMTP at Pure-
   Heart.ORG chooses to send the message for that recipient in a
   separate transaction with a reverse-path of <>.

<<< 220-Bombs.AF.MIL reporting for duty.
<<< 220 Electronic mail is to be used for official business only.
>>> EHLO Pure-Heart.ORG
<<< 502 command not implemented
>>> RSET
<<< 250 reset
>>> HELO Pure-Heart.ORG
<<< 250 Bombs.AF.MIL
>>> MAIL FROM:<[e-mail]>
<<< 250 ok
>>> RCPT TO:<[e-mail]>
<<< 250 ok
>>> DATA
<<< 354 send message
>>> (message goes here)
>>> .
<<< 250 message accepted
>>> MAIL FROM:<>
<<< 250 ok



Moore                       Standards Track                    [Page 25]

RFC 1891           SMTP Delivery Status Notifications       January 1996


>>> RCPT TO:<[e-mail]>
<<< 250 ok
>>> DATA
<<< 354 send message
>>> (message goes here)
>>> .
<<< 250 message accepted
>>> QUIT
<<< 221 Bombs.AF.MIL closing connection

10.5 Forward from [e-mail] to [e-mail]

   The SMTP at Pure-Heart.ORG relays the message to Tax-ME.GOV.  (this
   step is not shown).  MTA Tax-ME.GOV then forwards the message to
   [e-mail] (shown below).  Both Tax-ME.GOV and Pure-Heart.ORG
   support the SMTP DSN extension.  Note that RET, ENVID, and ORCPT all
   retain their original values.

<<< 220 BoonDoggle.GOV says hello
>>> EHLO Pure-Heart.ORG
<<< 250-mail.Big-Bucks.COM
<<< 250 DSN
>>> MAIL FROM:<[e-mail]> RET=HDRS ENVID=QQ314159
<<< 250 sender okay
>>> RCPT TO:<[e-mail]> NOTIFY=SUCCESS \
    ORCPT=rfc822;[e-mail]
<<< 250 recipient okay
>>> DATA
<<< 354 send message
>>> (message goes here)
>>> .
<<< 250 message received
>>> QUIT
<<< 221 bcnu

















Moore                       Standards Track                    [Page 26]

RFC 1891           SMTP Delivery Status Notifications       January 1996


10.6 "Delivered" DSN for [e-mail]

   MTA mail.Big-Bucks.COM successfully delivers the message to Bob@Big-
   Bucks.COM.  Because the sender specified NOTIFY=SUCCESS, mail.Big-
   Bucks.COM issues the following DSN, and sends it to Alice@Pure-
   Heart.ORG.

To: [e-mail]
From: [e-mail]
Subject: Delivery Notification (success) for [e-mail]
Content-Type: multipart/report; report-type=delivery-status;
    boundary=abcde
MIME-Version: 1.0

--abcde
Content-type: text/plain; charset=us-ascii

Your message (id QQ314159) was successfully delivered to
[e-mail].

--abcde
Content-type: message/delivery-status

Reporting-MTA: dns; mail.Big-Bucks.COM
Original-Envelope-ID: QQ314159

Original-Recipient: rfc822;[e-mail]
Final-Recipient: rfc822;[e-mail]
Action: delivered
Status: 2.0.0

--abcde
Content-type: message/rfc822

(headers of returned message go here)

--abcde--














Moore                       Standards Track                    [Page 27]

RFC 1891           SMTP Delivery Status Notifications       January 1996


10.7 Failed DSN for [e-mail]

   Because delivery to Carol failed and the sender specified
   NOTIFY=FAILURE for [e-mail], MTA Pure-Heart.ORG (the SMTP
   client to which the failure was reported via SMTP) issues the
   following DSN.

To: [e-mail]
From: [e-mail]
Subject: Delivery Notification (failure) for [e-mail]
Content-Type: multipart/report; report-type=delivery-status;
              boundary=bcdef
MIME-Version: 1.0

--bcdef
Content-type: text/plain; charset=us-ascii

Your message (id QQ314159) could not be delivered to
[e-mail].

A transcript of the session follows:

(while talking to Ivory.EDU)
>>> RCPT TO:<[e-mail]> NOTIFY=FAILURE
<<< 550 error - no such recipient

--bcdef
Content-type: message/delivery-status

Reporting-MTA: dns; Pure-Heart.ORG
Original-Envelope-ID: QQ314159

Original-Recipient: rfc822;[e-mail]
Final-Recipient: rfc822;[e-mail]
SMTP-Remote-Recipient: [e-mail]
Diagnostic-Code: smtp; 550 error - no such recipient
Action: failed
Status: 5.0.0

--bcdef
Content-type: message/rfc822

(headers of returned message go here)

--bcdef--






Moore                       Standards Track                    [Page 28]

RFC 1891           SMTP Delivery Status Notifications       January 1996


10.8 Relayed DSN For [e-mail]

   Although the mail gateway Ivory.EDU supports the DSN SMTP extension,
   the LAN mail system attached to its other side does not generate
   positive delivery confirmations.  So Ivory.EDU issues a "relayed"
   DSN:

To: [e-mail]
From: [e-mail]
Subject: mail relayed for [e-mail]
Content-Type: multipart/report; report-type=delivery-status;
    boundary=cdefg
MIME-Version: 1.0

--cdefg
Content-type: text/plain; charset=us-ascii

Your message (addressed to [e-mail]) was successfully
relayed to:

ymail!Dana

by the FooMail gateway at Ivory.EDU.

Unfortunately, the remote mail system does not support
confirmation of actual delivery.  Unless delivery to ymail!Dana
fails, this will be the only delivery status notification sent.

--cdefg
Content-type: message/delivery-status

Reporting-MTA: dns; Ivory.EDU
Original-Envelope-ID: QQ314159

Original-Recipient: rfc822;[e-mail]
Final-Recipient: rfc822;[e-mail]
Action: relayed
Status: 2.0.0

--cdefg
Content-type: message/rfc822

(headers of returned message go here)

--cdefg--






Moore                       Standards Track                    [Page 29]

RFC 1891           SMTP Delivery Status Notifications       January 1996


10.9 Failure notification for [e-mail]

   The message originally addressed to [e-mail] was forwarded
   to [e-mail], but the MTA for Boondoggle.GOV was unable to
   deliver the message due to a lack of disk space in Sam's mailbox.
   After trying for several days, Boondoggle.GOV returned the following
   DSN:

To: [e-mail]
From: [e-mail]
Subject: Delivery failure for [e-mail]
Content-Type: multipart/report; report-type=delivery-status;
              boundary=defgh
MIME-Version: 1.0

--defgh
Your message, originally addressed to [e-mail], and forwarded
from there to [e-mail] could not be delivered, for the
following reason:

write error to mailbox, disk quota exceeded

--defgh
Content-type: message/delivery-status

Reporting-MTA: Boondoggle.GOV
Original-Envelope-ID: QQ314159

Original-Recipient: rfc822;[e-mail]
Final-Recipient: rfc822;[e-mail]
Action: failed
Status: 4.2.2 (disk quota exceeded)

--defgh
Content-type: message/rfc822

(headers of returned message go here)

--defgh--












Moore                       Standards Track                    [Page 30]

RFC 1891           SMTP Delivery Status Notifications       January 1996


11. References

   [1] Postel, J., "Simple Mail Transfer Protocol", STD 10, RFC 821,
       USC/Information Sciences Institute, August 1982.

   [2] Crocker, D., "Standard for the Format of ARPA Internet Text
       Messages", STD 11, RFC 822, UDEL, August 1982.

   [3] Westine, A., and J. Postel, "Problems with the Maintenance of
       Large Mailing Lists.", RFC 1211, USC/Information Sciences
       Institute, March 1991.

   [4] Kle