procmail not delivering to ~/Maildir/

I am using procmail to deliver to a Maildir (which is my courier imap 
Inbox) in my home directory. Attempting to deliver directly to the 
Inbox results in an error; however, delivery to any folder within the 
Inbox works fine.
Take the following file structure:

Inbox:                  ~/Maildir
Subfolder:              ~/Maildir/.Subfolder
Alias Subfolder:        ~/Maildir/InboxAlias (soft link to ~/Maildir)

This recipe works:

:0
*
/home/tony/Maildir/.Subfolder/

As does:

:0
*
/home/tony/Maildir/.InboxAlias/

But, this one fails:

:0
*
/home/tony/Maildir/

The error I get when attempting to deliver ~/Maildir is:

procmail: Error while writing to 
"/home/tony/Maildir/tmp/1054063005.24550_0.ts/homer.demark.org"
procmail: Couldn't create or rename temp file 
"/home/tony/Maildir/tmp/1054063005.24550_0.ts/homer.demark.org"
I can't see how it can be a permissions problem since procmail has no 
issues delivering to ~/Maildir/.InboxAlias, which is simply a 
soft-link to ~/Maildir. The difference appears to be how procmail 
handles the tmp file.
So far, the InboxAlias soft link has been a viable workaround (IMAP 
clients see new mail in Inbox), but I want to figure out why this is 
happening and fix the issue.
Any comments would be appreciated.

Thanks,
- Tony





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