Passing info from formail to a perl script?

Let's say I use formail to grab the sender of a message:

        SENDER=`formail -rtzx To:`

Is it possible to pass this SENDER variable to a perl script that does some 
operations on the message?  I was thinking of something like:


SENDER=`formail -rtzx To:`
0h:
* ^Subject: . arbitrary command
| perlscript.pl

...and in the perlscript $SENDER is used.  Are the procmail variables created 
true environment variables?

John

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John Jensen      john(_at_)analysis(_dot_)net       Analysis.Net Survey Research
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