Mlocal,         P=/usr/bin/procmail, F=lsDFMAw5:/|@qSPfhn9, S=10/30, R=20/40,
                    T=DNS/RFC822/X-Unix,
                    A=procmail -Y -a $h -d $u
Mprog,         P=/bin/sh, F=lsDFMoqeu9, S=10/30, R=20/40, D=$z:/,
                    T=X-Unix,
                    A=sh -c $u
 

Exemplo:
ftphelp: "|/usr/local/bin/sendhelp"