save only mail body into a file

For one of my specific purposes I used to pass certain mails to a perl =

script in order to save/process ONLY the mail body.

It can simplify the process if I can directly drop a mail body into a =

file. I tried ':0 b' to save mailbody, 'formail -I' to remove mail =

headers, without success. I also fail to find useful hints by onine =

searches. Any advice/hint? :)

Thanks,
Zhiliang