suddenly kmail 2 doesn't read or find many messages structure well

Hi, 
my configuration is Fedora 17 kde-4.9.3 

the strange is new messages now often appears in text like this:
" This is a multi-part message in MIME format. 
--_----------=_1353607947433314555 Content-Disposition: inline
Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=utf-8;
"

send in attach, 2 examples, could you see message structure, how I do to
reparse message to see it well , if I redirect message to evolution,
evolution read it well, without problems.  

Thanks, 
-- 
Sérgio M. B.

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