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

Simple Virtual User Installation

System configuration

dovecot.conf

Below is a fully working dovecot.conf file. You can use it directly, but it might be better to instead use the included example-config as the base and make the same modifications to it.

If you want to configure SSL, see SSL.

protocols = imap pop3

# It's nice to have separate log files for Dovecot. You could do this
# by changing syslog configuration also, but this is easier.
log_path = /var/log/dovecot.log
info_log_path = /var/log/dovecot-info.log

# Disable SSL for now.
ssl = no
disable_plaintext_auth = no

# We're using Maildir format
mail_location = maildir:~/Maildir

# If you're using POP3, you'll need this:
pop3_uidl_format = %g

# Authentication configuration:
auth_verbose = yes
auth_mechanisms = plain
passdb {
  driver = passwd-file
  args = /etc/dovecot/passwd
}
userdb {
  driver = static
  args = uid=vmail gid=vmail home=/home/vmail/%u
}

/etc/dovecot/passwd

See AuthDatabase/PasswdFile for the full file format. Here we're interested only having usernames and passwords in it. Below's an example file:

test:{PLAIN}pass
bill:{PLAIN}secret
timo@example.com:{PLAIN}hello123
dave@example.com:{PLAIN}world234
joe@elsewhere.org:{PLAIN}whee
jane@elsewhere.org:{PLAIN}mypass

As you can see, you can use multiple domains in the file, or no domains at all. Dovecot doesn't care about domains.

Users can be added by editing this file. Dovecot automatically notices the new users immediately after they're added. It also creates their home directories when the user logs in.

Passwords

The passwords in the example passwd file are listed using plaintext scheme. It's possible to use other password schemes as well. For example SSHA would be a pretty strong scheme. You can create them using doveadm pw utility, for example:

doveadm pw -s ssha
Enter new password: foo
Retype new password: foo
{SSHA}DNODS3ZrOq1bu2MasNk79LxHhlU9iI03

Note that you won't get the same output after {SSHA} as above, because Dovecot uses random salts when creating the SSHA hash. This means that even if multiple users have the same password, you won't know that because their hashes are different.

The passwd file entry would be:

joe:{SSHA}DNODS3ZrOq1bu2MasNk79LxHhlU9iI03

Joe would now have "foo" as his password.

SMTP server configuration

Delivering mails

You can configure the SMTP server to deliver mails internally, or you can use Dovecot's deliver. Using deliver gives you better performance because it updates Dovecot's index files while saving the mails. See LDA for how to configure this. In config you should have:

protocol lda {
  postmaster_address = postmaster@example.com
}

SMTP AUTH

If you're using Postfix v2.3+ or Exim v4.64+ you can use Dovecot SASL instead of Cyrus SASL.

Quota

If you need to have quota, add this to dovecot.conf:

mail_plugins = $mail_plugins quota
protocol imap {
  mail_plugins = $mail_plugins imap_quota
}
plugin {
  quota = maildir
}

Then configure quota by adding userdb_quota_rule extra field to /etc/dovecot/passwd, for example:

joe:{PLAIN}pass::::::userdb_quota_rule=*:storage=100M
jane:{PLAIN}pass::::::userdb_quota_rule=*:storage=200M

Joe has now 100MB quota and Jane has 200MB quota. See Quota for more information about quota settings.

HowTo/SimpleVirtualInstall (last edited 2012-02-16 22:18:27 by TimoSirainen)