[Dovecot] dovecot-deliver occasionally fails to deliver, leaving no clues

[Lucas Madar]

Hello,

I have a FreeBSD 7.1 x86 system using dovecot with postfix and a mysql  
user database. Everything works completely fine, except that on  
occasion dovecot-deliver fails. When postfix tries to redeliver the  
message in about 15 minutes, it succeeds. So this isn't a very big  
problem, just an annoying puzzle.

Here's the postfix log. At first, I thought it could be a postfix  
delivery problem.
Oct 17 00:36:22 xxxxxxx postfix/pipe[16017]: 41E581CC5B: to=<xxxx at xxxxx.xxx 
 >, relay=dovecot, delay=0.04, delays=0.
01/0/0/0.03, dsn=4.3.0, status=deferred (temporary failure)

I turned on delivery logging to see what I'd get, and I simply get this:
deliver(xxxxxx at xxxxx.xxx): Oct 17 00:36:22 Info: Loading modules from  
directory: /usr/local/lib/dovecot/lda
deliver(xxxxxx at xxxxx.xxx): Oct 17 00:36:22 Info: Module loaded: /usr/ 
local/lib/dovecot/lda/lib90_cmusieve_plugin.so
(normally, here it would print out more info about the user, as "auth  
input" lines, but it doesn't when it fails in this way)

Dovecot is not dumping core, or even printing out any error message  
that I can see. I have all logging turned on (except for passwords),  
and I still seem to get nothing. I've attached my dovecot -n output,  
which doesn't seem to contain the logging I have set up for deliver:

   log_path = /var/log/delivery.log
   info_log_path = /var/log/delivery.log
   mail_debug = yes
   auth_debug = yes
   auth_verbose = yes

Any clue as to what could be going on here?

Thanks,
Lucas

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