 4

  
SMTP, POP3, I4

        
Internet    (e-mail)    ,
  . ,    -
  e-mail,      
Internet. E-mail-       -
       .  Inter-
net     "" -   -
.

SMTP

       SMTP
(Simple Mail Transfer Protocol,    ). 
SMTP      
   Internet.      -
      Internet. SMTP  
 ,     SMTP 
  .     
       e-mail, -
 SMTP-.     , 
Microsoft Mail, Microsoft Exchange  Lotus cc:Mail.

SMTP       -
,        
 .      
      SMTP
     . SMTP  -
    ,  