Processing single messages in a stream

Sorry, I still don't have a good grasp on all the modules in Mail::Box.

I have a bunch of messages coming as a stream on stdin, in mbox format.
I need to process the messages one-by-one, but I don't need to access
them like a entire mbox.

This is for indexing messages.  So I'm looking for the fastest way to
process each message, have access to all the MIME parts and Mail::Header
methods so I can reformat and then output.  Basically, I'm
looking for a filter where I can pipe one or more messages.

I need to pick the best MIME part -- for example, use text/plain if
available, otherwise parse out the text from text/html -- I'm just
interested in parsing the text for a search engine.

I can use Mail::Box::Manager, but there seems to be a bit of overhead
loading all the messages.

Can someone suggest what modules would provide this ability.

Thanks,


-- 
Bill Moseley
[email protected]