 4.     SMTP, , 14_______________187

S : Jones@BBN-Vax.ARPA

S

S Hello! I am John.

S    .

R 250 OK

S QUIT

R 221 USC-ISIE.ARPA Service closing transmission channel

 SMTP-  
8- 

      SMTP  7- -
.      SMTP. -
,  ,   ,   
ASCII-,    ,      -
, ,  ,      7-
. ,       MIME, -
      "quoted-printable" 
"base64".

,  SMTP-    SMTP
(ESMTP)   8-    "MIME 8bit", -
         SMTP  8 .

   ,   SMTP- 
"MIME 8bit",    EHLO    -
 HELO  ESMTP.       
"250 OK"  "250 8BITMIME":

: EHLO <client.domain>

S: 250-<server.domain> says hello

S: 250 8BITMIME

(  ^)

 ESMTP  MAIL   : BODY,   -
 : "71"  "8BITMIME".

  MAIL   "BODY=8BITMIME".   -
  "250",   8- .  -
    8-   ESMTP:

: EHLO ymir.claremont.edu

S: 250-dbc.mtview.ca.us says hello

S: 250 8BITMIME