Kmail 3?

[cr]

Having just had *three* timewasting emails sent me with huge attachments 
courtesy of Klez-e and Mickey$oft's virus-friendly operating system, I'm very 
keen to try Kmail 3 (is it?) which reputedly has a facility to block the 
download of emails over a specified size.  

What do I need to do to get Kmail 3?    (If it is 3, that is).   I'm 
currently running RH 7.2 with Gnome and Kmail 1.3.1   from KDE 2.2-11   (I've 
previously called it Kmail 2 in error).    Do I have to install all of KDE 3? 

I assume, by the way, that Linux email programs are immune from klez-e?   
  
cr
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