[Dovecot] Dovecot Maildir ownership/permission problem

[ikevinjp]

Hi,

I have successfully configured Dovecot+Postfix+SSL/TSL and it seems that
everything is working except that I have a permission problem with the items
under Maildir.

When a mail is first delivered into a user, Postfix automatically creates
the Maildir using the user's account and group. It is readable only by the
user. This seems to be the correct setting for me, as only the user could
read his/her own mails.

However, Dovecot gave an error saying the Maildir is inaccessible and shows
that is a permission problem. I changed the chmod to 777 and Dovecot worked
(temporarily solution). And, it created additional items under that folder
under a "mailman" user (which I specified in the configuration using
mail_uid and mail_gid) - Note: it does not work if I do not set these
"mail_uid" and "mail_gid" settings.

I think what I would like is to make Dovecot access each individual's
mailbox using the user's own account and group. How do I do this? I am using
Passwd-file scheme.

--- My dovecot.conf:

mail_uid = vmail
mail_gid = vmail
listen = 192.168.1.2
protocols = imap pop3
ssl = yes
ssl_cert = </usr/local/etc/sslcerts/server.crt
ssl_key = </usr/local/etc/sslcerts/server.key
mail_location = maildir:/home/%n/Maildir
maildir_copy_with_hardlinks = yes
auth_mechanisms = cram-md5
service auth {
  unix_listener auth-client {
    group = postfix
    mode = 0660
    user = postfix
    path = /var/spool/postfix/private/auth
  }
  user = root
}
passdb {
  driver = passwd-file
  args = username_format=%n /usr/local/etc/dovecot/dovecot.users
}
log_path = /var/log/dovecot.log

---

--- Some entries on my passwd-file would be:

username:{CRAM-MD5}efaa8bbe8fb0d28a55f7595c3420791990f25cc536f0e23c46cb392cb2b058e2:1001:1001::/home/username::
peter:{CRAM-MD5}512b3e383d95a191d9481e1914cc4caad70cd57029706ec5c3db8ef3039ef405:2001:2001::/home/peter::

---
Any advice is greatly appreciated. Thanks!

Kevin.
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