Procs From Line

If I look in my logfile I see that Porcmail has extracted the Address
of the person who sent the mail and put it in a line that starts with
> From ....
What I want to know is, instead of me using formail to get the persons
email address how can I just use the info that procmail is already getting
for its log file?  This way I can just use its From address and not have
to get it using formail which just takes more time....

ff