Denying special privileges & Error while writing .from

I am getting the following errors

        Aug 31 20:47:36 ngrdev procmail[17456]: Denying special privileges
        for "/etc/procmailrcs/.procmailrc.virtual" 

        Aug 31 20:47:36 ngrdev procmail[17456]: Error while writing to
        "/home/virtual-mail-users/.from" 

when sending messages to the following alias (all one line, of course):

a_test: "| procmail -m VIRTUALUSER=a_test 
RECEIPIENTS=antonio(_at_)axolotl(_dot_)ic(_dot_)gc(_dot_)ca 
/etc/procmailrcs/.procmailrc.virtual"

I know procmail is picky when it comes to permissions, but I really can't
seem to figure this. Below are the permissions for all files in question
(I think). Could someone solve the riddle? Thanks in advance.

Antonio


The permissions on /etc/procmailrcs:

drwxr-xr-x   2 root     other         512 Aug 31 17:05 procmailrcs/

The actual recipe file:

-rw-r--r--   1 antonio  ic-staff     1352 Aug 31 16:51 .procmailrc.virtual

The directory where I want to write the messages in:

drwxr-xr-x   2 antonio  ic-staff      512 Aug 31 18:03 virtual-mail-users/

The procmail binary:

antonio(_at_)ngrdev$ ls -lag /usr/local/bin/procmail 
-rwsr-sr-x   1 root     mail        75632 Dec  7  1998 /usr/local/bin/procmail