178  Internet

    ,      -
.

3.  SMTP    SMTP.  -
    ,    .

	<^	Sender-SMTP	SMTP ,    <>	Receiver -SMTP	<-	
						
	<->					
						
 						 
						

 SMTP
. 4.1.   SMTP-

 SMTP

SMTP     :  
        , 
           -
 ;    SMTP (. .   ),  -
      .

  MAIL     , . .
SMTP-     .   RCPT
     .   
       SMTP--
, ,    .

SMTP-    .  
   .     
   ASCII.       
 (       -
).      8- , 
 7-     ()  = 0.

 ,  

 SMTP      .  -
   MAIL,  ,  
  RCPT,    , 
  DATA    .  -
     .

   MAIL   :

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

 <SP>   , <CRLF>   , <reverse-
path>      .   -