[Dovecot] Maildir, procmail, and locks

[Mark Nienberg]

I'm using procmail as the local delivery agent for Maildir style 
mailboxes.  I discovered that I was able to send mail to other users but 
  was unable to send mail to myself. Examples from verbose procmail log:

**** Successful message to another user ****
procmail: [24589] Fri Jun  2 15:03:34 2006
procmail: Assigning 
"PATH=/home/david/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin"
procmail: Assigning "LASTFOLDER=/home/david/Maildir/new/msg.4AAdC"
procmail: Opening "/home/david/Maildir/new/msg.4AAdC"
procmail: Acquiring kernel-lock
procmail: Notified comsat: "david at 0:/home/david/Maildir/new/msg.4AAdC"
 From mark.nienberg at tippingmar.com  Fri Jun  2 15:03:34 2006
  Subject: test to other user
   Folder: /home/david/Maildir/new/msg.4AAdC


**** Failed message to myself ****
procmail: [24596] Fri Jun  2 15:05:13 2006
procmail: Assigning 
"PATH=/home/mark/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin"

procmail: Couldn't create or rename temp file "/home/mark/Maildir/new/msg.A"

procmail: Assigning "LASTFOLDER=/var/mail/mark"
procmail: Opening "/var/mail/mark"
procmail: Acquiring kernel-lock
procmail: Notified comsat: "mark at 686:/var/mail/mark"
 From mark.nienberg at tippingmar.com  Fri Jun  2 15:05:13 2006
  Subject: test to self
   Folder: /var/mail/mark


Anyway, I changed dovecot's lock_method from the default fcntl to flock 
and the problem disappeared.  I'll add this to the wiki unless someone 
points out an error in my method.

Mark Nienberg