[exim] Exim Filter, access to envelope

Hi all,
how to access the envelope-to/ -from in an exim filter?
I would like to display the envelope with a logwrite statement.

Regards
Rainer Sigl

-- 
-----------------
Rainer Sigl,                      | email: sigl@???
MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3557
Postfach 1312,                    | fax:   +49 (89) 30000-3569
D-85741 Garching, Germany         | web:   http://www.mpe.mpg.de/~sigl/