[Spambayes] uncaptured python exception

[Tony Meyer]

> Spambayes has been working great for me, except it always 
> eventually gets to the point where I can't do any more
> training using the proxy. 
[...]
> (exceptions.NameError:global name 'message_from_string' is 
> not defined 

This was a bug in 1.0a9 and has since been fixed.  If you upgrade to 1.0b1
that should fix the problem.

=Tony Meyer

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