This documentation is for Dovecot v2.x, see wiki1 for v1.x documentation.

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 -n1

Your configuration file doesn't exist if you installed Dovecot from sources. The config directory should contain a README file pointing to an example configuration, which you can use as your basic configuration. For example:

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

The default configuration starts from dovecot.conf, which contains an !include conf.d/*.conf statement to read the rest of the configuration. This split of configuration files isn't a requirement to use, and it doesn't really matter which .conf file you add any particular setting, just as long as it isn't overridden in another file. You can verify with doveconf -n that everything looks as you intended.

Authentication

By default Dovecot is set up to use system user authentication. If you're planning on using system users, you can simply skip this section and read PAM (or bsdauth for configuring it.

If you're planning on using virtual users, it's easier to first 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 (see VirtualUsers).

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 is configured.

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

# Add '#' to comment out the system user login for now:
#!include auth-system.conf.ext

# Remove '#' to use passwd-file:
!include auth-passwdfile.conf.ext

In conf.d/auth-passwdfile.conf.ext you should have:

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

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

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.

mbox

If you're using mboxes, it's important to have locking configuration correct. See MboxLocking 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 conf.d/10-mail.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.

BasicConfiguration (last edited 2013-05-23 15:40:36 by gatei2)