188___________________________________________ Internet

 MAIL FROM:<ned@ymir.claremont.edu> BODY=8BITMIME

S 250 <ned@ymir.claremont.edu>... Sender and 8BITMIME ok

 RCPT T0:<mrose@dbc.mtview.ca.us>

S 250 <mrose@dbc.mtview.ca.us>... Recipient ok

 DATA

S 354 Send 8BITMIME message, ending in CRLF.CRLF.

 .

250 OK

       ,  -
  MIME-   "8bit", . .    -
    SMTP-,   1000 .

         -
  SMTP  "binary" ,   .   -
 ,     SMTP,   
CHUNKING.

CHUNKING-     DATA -
   BDAT.      7bit,
8BITMIME   BINARYMIME,     
  .

   ,    SMTP- 
CHUNKING,    EHLO.   
 "250 CHUNKING",  ,   SMTP   
 BDAT.  BDAT     -
  DATA, . .    -   -
 7-   DATA   BDAT.

( ^)

   DATA  BDAT   SMTP-.
 BDAT   :

BDAT chunk-size [LAST]

 <chunk-size>     ,   
LAST ,      .

       BINARYMIME,  -
  MAIL    BODY=BINARYMIME. ,
  BDAT,   .  -
      (R  , S  -
 SMTP-).

R: <wait for connection on TCP port 25>
S: <open connection to server>