How to pass auth state to procmail?

server postfix # grep procmail master.cf
procmail unix - n n - 20 pipe
flags=R user=cyrus argv=/usr/bin/procmail -o Sender=${sender} -m USER=
${user} EXTENSION=${extension} /etc/procmailrc
sserver postfix # grep procmail main.cf
#mailbox_command = /some/where/procmail
#mailbox_command = /some/where/procmail -a "$EXTENSION"
mailbox_transport = procmail

I want to do some checks in procmail depending on the auth state.

How can I pass the auth state to procmail?

ervin