Procmail as a local mailer?

Hello,

I'm having problems getting Sendmail 8.7.4 to user procmail as my local 
mailer. Here's my Delivery Agent section from sendmail.cf:

##################################################
###   Local and Program Mailer specification   ###
##################################################

#####  @(#)local.m4     8.21 (Berkeley) 11/6/95  #####

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

And I'm getting error messages such as these:

   ----- The following addresses have delivery notifications -----
<sotnickd(_at_)confused(_dot_)ddv(_dot_)com>  (transient failure)

   ----- Transcript of session follows -----
451 mailer local died with signal 11
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 Arguments: procmail -f sotnickd(_at_)underground(_dot_)net -Y -a  -d sotnickd
<sotnickd(_at_)confused(_dot_)ddv(_dot_)com>... Deferred
 Warning: message still undelivered after 4 hours
 Will keep trying until message is 5 days old

---

What's signal 11? Perhaps my permissions aren't set right? I followed the 
examples/advanced section 2 for using procmail as a local mailer and that 
didn't work either.

Thanks,

Dave Sotnick