 4.     SMTP, , 14______________179

  SMTP,     
,         
    .    
 SMTP    <reverse-path>   -
  .   SMTP  -
,    " 250 "  "250
OK",  250      .

  SMTP-    ,  -
   .    ,
       -
    .      -
      . 
          
  .  ,    -
  SMTP     .    -
  - SMTP-,   -
    .   
      RFC, , RFC-821.

D        RCPT:

RCPT <SP> T0:<forward-path> <CRLF>

 <forward-path>      . 
        -
 .  -     -
 ,   550  "    
      ".  -
 ,    "250 OK".

D       DATA:

DATA <CRLF>

    SMTP   354,  -
  .     -
  :    .   -
   <CRLF>.   
     "<CRLF>.<CRLF>",
   "250 OK".  ,    -
.         -
  .

(~ ^)

 ,     SMTP-,   -
 <CRLF>    1000 .