dovecot - Jan 2014 - Dovecot doesn't seem to read userdb for the first delivery

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Hello List,

First of all, this is my first post so please bear with me if I miss 
something.

I'm using Postfix with Dovecot 2.0.19 as the LDA. The home directory is 
of the
form `/var/mail/virtual/<domain>/<username>`. The mail directory is 
under the
home directory and named `mail`. `mail_location` is left empty, and 
userdb is
specified using SQL:

user_query = SELECT uid     AS uid, \
                     gid     AS gid, \
                     homedir AS home, \
                     maildir AS mail \
              FROM users WHERE email = '%u'

Everything had been fine, until I added a new user. In the log, Dovecot
complains that it doesn't have permission to create the mail directory 
(email
address replaced):
> Jan 2 05:46:19 mail1 dovecot: lda(test at test.com): Error: user 
> test at test.com:
> Initialization failed: Initializing mail storage from mail_location 
> setting
> failed: mkdir(mail) in directory /var/spool/postfix failed: Permission 
> denied
> (euid=5000(virtual) egid=5000(virtual) missing +w perm: 
> /var/spool/postfix,
> dir owned by 0:0 mode=0755)
Sometimes it complains about /run/dovecot instead of /var/spool/postfix, 
but I
think that doesn't really matter. I think not specifying `mail_location`
confused Dovecot, as explained in [MailLocation][1]. When I put in the 
right
value for `mail_location` the error went away.

What I don't understand is, it is said in the [same document][1] that 
the
userdb field `mail` will override `mail_location` anyway. I would think 
that I
can skip `mail_location` if I specify userdb `mail` for all users. Is 
the
document wrong?

Thanks,
Phu

[1]: http://wiki2.dovecot.org/MailLocation
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