Maildirs & "Couldn't rename bogus..."

Hello there, I have a working procmail setup but I'm trying to get rid
of this message in my maillog, which shows up for every message we
receive:

Mar 13 09:04:47 ns procmail[4267]: Couldn't rename bogus 
"/var/spool/mail/jordanc" into "/var/spool/mail/BOGUS.jordanc.IXjC"

I am using Exim with maildirs, so it shouldn't be worrying about
/var/spool/* at all.  How can I disable this BOGUS stuff?

The Setup:
Red Hat 7.2 (procmail 3.21)
Exim

Contents of /etc/procmailrc:

MAILDIR=$HOME/Maildir
DEFAULT=$MAILDIR/


Contents of users' .procmailrc files:

:0 Wc
 | spamc -c
:0 We
spam

:0
* !^X-Virus-Scan:
* multipart
| /etc/emailscan/emailscan

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