Does wrapper only work for python modules or can I call other (ie, perl) modules from it?

I've tried to pass thru wrapper into a perl script, but I've been getting (among other things)

----- Transcript of session follows ----- Illegal command: /home/webmaster/readmsg.pl 554 "|/home/mailman/mail/wrapper /home/webmaster/readmsg.pl"... unknown mailer error 6

I've tried changing the pipe to

"|perl /home/webmaster/readmsg.pl" - but perl cant read the script because it's got root:root permissions (I need them if I'm going to be updating /etc/aliases)

I've also tried going straight to the "|/home/webmaster/readmsg.pl" - but I get a permissions error that I cant figure out since the script is set to set uid when executed (and as I mentioned, it is a root:root)

----- Transcript of session follows ----- sh: /home/webmaster/readmsg.pl: Permission denied 554 "|/home/webmaster/readmsg.pl"... unknown mailer error 126

Any help/experience/pointers to FAQs on passing off msgs from sendmail to perl scripts would be appreciated.

(BTW: sendmail is an old 8.5 version... perl is 5.004 - and no, I cant upgrade either right now...)

Thanks Scott.