exim and procmail?

["David S. Jackson" <dsj@dsj.net>]

I have been getting an error procmail which has been bouncing my mails
to debian-user.  Basically, the procmail log messages get echoed back
to the debian list server.  I edited a line in /etc/exim.conf:

userforward:
  driver = forwardfile
  no_verify
  check_ancestor
  file = .forward
  ###modemask = 002
  filter
...


After commenting modemask the error seems to go away.  I only have one
user on the system right now (me).  

My question is why should I have been getting this error in the first
place?

>A message that you sent could not be delivered to all of its
>recipients. The
>following address(es) failed:
>
>  dsj@dsj.net:
>    generated | /usr/bin/procmail -p
>
>The following text was generated during the delivery attempt:
>
>------ | /usr/bin/procmail -p ------
>
>procmail: [30016] Wed Nov 17 17:23:03 1999
>procmail: Assigning "PATH=/bin:/usr/bin:/usr/sbin"
>procmail: Assigning "MAILDIR=/home/dsj/mail"
>procmail: Assigning "PMDIR=/home/dsj/procmail"
>procmail: Assigning "LOGFILE=/home/dsj/procmail/log"
>procmail: Opening "/home/dsj/procmail/log"
>
>------ This is a copy of the message, including all the headers.
>------


Any help gladly appreciated!

TIA

--
David S. Jackson                           http://www.dsj.net
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"Zen is not some kind of excitement, but concentration on our 
usual everyday routine."     --Shunryu Suzuki