Added security item for kmail users

[Gene Heskett]

Greetings;

Since the knowledge of the users os and email agent can and does aid the 
hackers in crafting an attack on a given machine, I checked, and my emails 
sent do contain the kmail version as a header line.  That isn't an obvious 
way to configure it except as an override the default, somewhat of a back 
door.

So, under kmail>config>composer/header, click on new, click on the line to 
get focus and type 'User-Agent' without the quotes, and click apply, then 
close.  That header line, because it has no content then apparently 
overrides the default, causing that line to be removed as you can verify by 
hitting 'v' while reading this message in your copy of kmail.

Tisn't much of course, but every little bit helps IMO.

Cheers, Gene
-- 
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