174                       __ ___ _________________ Internet

    ASCII-.   
"8bit"  "binary"      .  
"8bit"     SMTP-  1000 , 
  "binary"   .

 ^)

 "8bit",  ,      
  ,   "binary"    ,
  . .        SMTP  
  8- , . .    SMTP-
ESMTP.

 "base64"  "quoted-printable"  
     00-FF   
 ASCII.

 "quoted-printable",  ,   -
     ,   
    (7FFF).  "Quoted-printable"
 ,       (00  7F)
    .    
       (,  , 
  ).    "quoted-
printable"      , ,  
     :

1.         
"="     . ,
 "1"     '=49',   "="  '=61'.

2. ,    33  60   62  126   
ASCII-, . .  "1"   "quoted-printable"  '.

3.       ,
  . .     , ,  RFC-1341.

 "base64" ,  ,  
""    ,  , 
 .  , -    (
)  .    "base64"
     , ,  ,   -
      :

1.       24 , ,  
,      6 .

2.       4- ASCII-
(   base64)    ,  
      , 
  "+"  "/".