dovecot - Feb 2006 - Postfix: Command died with status 89: "/usr/lib/dovecot/deliver"

One of our servers running Dovecot 1.0.beta3 and dovecot-lda has  
failed to deliver a few messages and I can't figure out why. Very few  
messages bounce and I don't see any common thread between them other  
than time. The 15:19:11 message was a company wide announcement and  
the other 4 servers (identical configuration) were able to deliver it.

Feb 26 20:24:46 rental deliver: open(/tmp/dovecot.deliver.. 
1141003486.9152.94b403f750d9ce0b) failed: Permission denied
Feb 26 20:24:46 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 26 20:24:46 rental deliver: Can't sync delivery mail
Feb 27 09:57:13 rental deliver: open(/tmp/dovecot.deliver.. 
1141052233.12958.20786c4677df8930) failed: Permission denied
Feb 27 09:57:13 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 27 09:57:13 rental deliver: Can't sync delivery mail
Feb 28 09:00:25 rental deliver: open(/tmp/dovecot.deliver.. 
1141135225.20088.aedaad0b0720edda) failed: Permission denied
Feb 28 09:00:25 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 28 09:00:25 rental deliver: Can't sync delivery mail
Feb 28 15:19:11 rental deliver: open(/tmp/dovecot.deliver.. 
1141157951.21988.6a7426202e533221) failed: Permission denied
Feb 28 15:19:11 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 28 15:19:11 rental deliver: Can't sync delivery mail
Feb 28 15:19:11 rental deliver: open(/tmp/dovecot.deliver.. 
1141157951.21990.6a7426202e533221) failed: Permission denied
Feb 28 15:19:11 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 28 15:19:11 rental deliver: Can't sync delivery mail
Feb 28 15:19:11 rental deliver: open(/tmp/dovecot.deliver.. 
1141157951.21992.6a7426202e533221) failed: Permission denied
Feb 28 15:19:11 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 28 15:19:11 rental deliver: Can't sync delivery mail
Feb 28 15:19:11 rental deliver: open(/tmp/dovecot.deliver.. 
1141157951.21993.6a7426202e533221) failed: Permission denied
Feb 28 15:19:11 rental deliver: i_stream_stat() failed with mbox file  
(read-only mbox stream): Permission denied
Feb 28 15:19:11 rental deliver: Can't sync delivery mail


--
Jacob Elder