extracting the "from" and "Subject" headings and writing them to a log

I am a new-bee to procmail;

I want to be able to extract the "from" and "subject" headings from emails
that bounce and store them into a file.  So for example if I send an email
to erwin(_at_)hotmail(_dot_)com with subject heading "hello there".  If the 
email comes
bounces and comes I want to be able to extract "erwin(_at_)hotmail(_dot_)com" 
an "hello
there" and store it into a file without the server name it bounced from and
without the body.  This is so that I can get rid of the people in my list
with bad email addresses.



Thank you all
Erwin

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