adilas...@yahoo.co.id wrote:
> 
> Gimana sih cara bisa tahu kelemahan SMTP, krn ini bahaya sekali buat 
> kita2.


Mesti baca dan memahami RFC untuk SMTP :-)


http://www.faqs.org/rfcs/rfc821.html
http://www.faqs.org/rfcs/rfc2821.html

Dari section 7.1:
    SMTP mail is inherently insecure in that it is feasible for even
    fairly casual users to negotiate directly with receiving and relaying
    SMTP servers and create messages that will trick a naive recipient
    into believing that they came from somewhere else.


Intinya sih, ini protokol jadul, yang berasumsi tidak ada penjahat di 
dunia maya :-)


Salam
Albert

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