reading stdin/munpack decoding html email

I have a script running from getmail that sends an sms on receipt of
email, that works well.

but, I would like to include contents of the email, (or part of it);
inbound email is HTML only, no text part

getmail passess the fetched email on stdin, so I need to read stdin,
munpack detach html 'part2' then, put 160 chars of 'part2' to sms

I've found this

#!/bin/bash
VALUE=$(cat)
echo "$VALUE" > email

gets whole email written out, I'm trying to feed it to munpack in more
elegant way that that I'm doing, using file after file written out to disk

munpack -t -f email

can I just pipe it? to munpack, this is where I get lost, trail'n'error is
lousy substitute for proper syntax



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