[CentOS] Random procmail filter failures.

Hi all,

I'm seeing a random issue with my procmail filters (only on email from  
this list) where once every so often, it will fail to filter a  
message. I am sorting by the to/cc email address, and this rule works  
on 99.9% of posts, however every now and again, I see something like  
this happen:

 From centos-bounces at centos.org  Sat Jan  5 01:57:28 2008
  Subject: Re: [CentOS] What's up with the mailing list spam?
   Folder: /home/netwiz/Maildir/.CentOS-Discussion/new/ 
msg.br32             4852
procmail: Match on "(To|Cc).*centos at centos.org*"
procmail: Couldn't create or rename temp file "/home/netwiz/ 
Maildir/.CentOS-Discussion/new/msg.A"
procmail: Assigning "LASTFOLDER=/home/netwiz/Maildir/new/ 
1199459595.7065_1.zeus.crc.id.au"
procmail: Notified comsat: "netwiz at 0:/home/netwiz/Maildir/new/ 
1199459595.7065_1.zeus.crc.id.au"

Most posts work perfectly, and show up as such:

 From centos-bounces at centos.org  Sat Jan  5 02:13:15 2008
  Subject: Re: [CentOS] Firewall frustration
   Folder: /home/netwiz/Maildir/new/ 
1199459595.7065_1.zeus.crc.id.au        5944
procmail: Match on "(To|Cc).*centos at centos.org*"
procmail: Assigning "LASTFOLDER=/home/netwiz/Maildir/.CentOS- 
Discussion/new/msg.gr32"
procmail: Opening "/home/netwiz/Maildir/.CentOS-Discussion/new/msg.gr32"
procmail: Acquiring kernel-lock
procmail: Notified comsat: "netwiz at 0:/home/netwiz/Maildir/.CentOS- 
Discussion/new/msg.gr32"

File and directory permissions on my Maildir directory etc are fine,  
and I'm at a loss to explain this. I've run fsck over the disk with no  
sign of errors.

Has anyone stumbled upon this before?

--
Steven Haigh

Email: netwiz at crc.id.au
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897