I solved it:
> sub filter_end ($) {
>     my($entity) = @_;
> ....
>     my $from_header = $entity->head->get("From");
chomp($from_header);
>     $from_header =~ s/^.*<//;
>     $from_header =~ s/>$//;
>     $from_header = lc($from_header);
Regards.
Petra Humann
-- 
Mail:    humann at tcs.inf.tu-dresden.de
WWW:     http://wwwtcs.inf.tu-dresden.de/~humann/