Please make Balsa more robust

[Helmut Jarausch <jarausch skynet be>]

Hi,
sometimes I get emails which crash Balsa on my machine (Gentoo Linux /  
Balsa GIT).
I have to edit my (huge) mbox file to remove that bogus email to be  
able to use Balsa any longer.
I would be nice if Balsa would safe-guard itself w.r.t. to such  
crashes, perhaps displaying just
the header and some error message.

If you need some example emails I'd like to supply these - please tell  
where I should
upload these since they are too large to be appended here.

Many thanks for Balsa,
Helmut