A mailserver (Centos 4) I manage can't deliver messages to user's mail folder. Before this problem I haven't had any Here is what maillog reports:

postfix/local[4674]: AD90FA7527: to=<mail@xxxxx.yyyyy.zz>, relay=local, delay=39,
status=deferred (temporary failure. Command output: /usr/bin/maildrop: 
Unable to open mailbox. )

If I run maildrop -d user -V 9 I see:

maildrop: authlib: groupid=0
maildrop: authlib: userid=0
maildrop: authlib: logname=user, home=/home/user, mail=(default)
maildrop: Changing to /home/user

It sticks there for a couple of minutes, then:

maildrop: Timeout quota exceeded.

Users don't have disk quotas, and I already run df -h which says I have a lot of free space remaining.

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Do you use mbox mail storage? Does the inbox exceeds the 2GB limit? Does your problem exists for all mailboxes or just for a few? What about a new user which you created right now? – mailq Nov 23 '11 at 21:29
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