BasicConfiguration.txt   [plain text]

Basic Configuration
===================

This page tells you the basics that you'll need to get a working Dovecot
installation.

Find Dovecot configuration file location using:

---%<-------------------------------------------------------------------------
doveconf -n | head -1
---%<-------------------------------------------------------------------------

Your configuration file doesn't exist if you installed Dovecot from sources.
You can copy example configuration from the location printed by doveconf. For
example:

---%<-------------------------------------------------------------------------
cp -r /usr/local/share/doc/dovecot/example-config/* /etc/dovecot/
---%<-------------------------------------------------------------------------

Authentication
--------------

Here we're going to create a simple passwd-like file to make sure that the
authentication will work. Later when you know Dovecot is working, you can do it
differently:

 * If you're going to use system users, see <PAM> [PasswordDatabase.PAM.txt].
 * If you're going to use virtual users, see <VirtualUsers.txt>.

Run as your own non-root user:

---%<-------------------------------------------------------------------------
echo "$USER:{PLAIN}password:$UID:$GID::$HOME" > users
sudo mv users /etc/dovecot/
---%<-------------------------------------------------------------------------

You can (and should) replace the "password" with whatever password you wish to
use, but don't use any important password here as we'll be logging in with
insecure plaintext authentication until <SSL.txt> is configured.

If you used the example configuration files, switch to passwd-file by modifying
'conf.d/10-auth.conf':

---%<-------------------------------------------------------------------------
!include auth-passwdfile.conf.ext
---%<-------------------------------------------------------------------------

In 'auth-passwdfile.conf.ext' you should have:

---%<-------------------------------------------------------------------------
passdb {
  driver = passwd-file
  args = scheme=CRYPT username_format=%u /etc/dovecot/users
}
---%<-------------------------------------------------------------------------

Verify with 'doveconf -n passdb userdb' that the output looks like this (and
there are no other passdbs or userdbs):

---%<-------------------------------------------------------------------------
passdb {
  args = scheme=CRYPT username_format=%u /etc/dovecot/users
  driver = passwd-file
}
userdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}
---%<-------------------------------------------------------------------------

Plaintext Authentication
------------------------

Until SSL is configured, allow plaintext authentication in the
'conf.d/10-auth.conf' file. You probably want to switch this back to "yes"
afterward.

---%<-------------------------------------------------------------------------
disable_plaintext_auth = no
---%<-------------------------------------------------------------------------

If you didn't use the temporary passwd-file created above, don't do this if you
don't want your password to be sent in clear to network. Instead get SSL
configuration working and connect to Dovecot only using SSL.

Mail Location
-------------

Set the 'mail_location' in 'conf.d/10-mail.conf' as determined by the
instructions in <FindMailLocation.txt>. ('default_mail_env' in older Dovecot
versions)

mbox
----

If you're using mboxes, it's important to have locking configuration correct.
See <MboxLocking.txt> for more information.

If you're using '/var/mail/' or '/var/spool/mail/' directory for INBOXes, you
may need to give Dovecot additional permissions so it can create dotlock files
there. A failure to do so will result in errors like these:

---%<-------------------------------------------------------------------------
open(/var/mail/.temp.host.1234.abcdefg) failed: Permission denied
file_lock_dotlock() failed with mbox file /var/mail/user: Permission denied
---%<-------------------------------------------------------------------------

From here on I'm assuming the INBOX directory is '/var/mail'.

First check what the permissions of '/var/mail' are:

---%<-------------------------------------------------------------------------
# ls -ld /var/mail
drwxrwxrwt 2 root mail 47 2006-01-07 20:44 /var/mail/
---%<-------------------------------------------------------------------------

In this case everyone has write access there and the directory is marked
sticky. This allows Dovecot to create the dotlock files, so you don't need to
do anything.

---%<-------------------------------------------------------------------------
# ls -ld /var/mail
drwxrwxr-- 2 root mail 47 2006-01-07 20:44 /var/mail/
---%<-------------------------------------------------------------------------

In this case only the root and the 'mail' group has write permission to the
directory. You'll need to give Dovecot's mail processes ability to use this
group by changing 'dovecot.conf':

---%<-------------------------------------------------------------------------
mail_privileged_group = mail
---%<-------------------------------------------------------------------------

Note: Specifying the privileged user must be done as shown. Simply adding
'dovecot' user to the 'mail' group does /*not*/ grant write permission.

(This file was created from the wiki on 2011-11-16 14:09)