Courier IMAP is a pop3 and imap daemon.

Userdb authentication setup

I’m using userdb for authentication. There are other schemes you can use such as PAM, MySQL or Postgres.

userdb is a disk based authentication, similar to standard passwd files.

Initial Setup

• postfix setup with vmailbox must be setup first.
• Install packages courier-authlib-userdb, courier-imap-ssl, courier-pop-ssl
• mkdirs

# mkdir /etc/courier
# touch /etc/courier/userdb
# chmod 600 /etc/courier/userdb

• Turn on the userdb authentication scheme. Edit /etc/courier/authdaemonrc

set authmodulelist="authuserdb"

• Decide which daemons to start.

Setup per email

• Determine uid and gid of vmail This will be the vmail user setup as part of postfix initial setup.

# id vmail
uid=1002(vmail) gid=1002(vmail) groups=1002(vmail)

In the above example, the id is 1002.

• Add to userdb

# userdb "testuser@example.com" set home=/var/mail/vhosts/example.com/testuser \
  mail=/var/mail/vhosts/example.com/testuser uid=1002 gid=1002

After this command you should see a new entry in /etc/courier/userdb The mail parameter is used so it is not defaulted to $home/Maildir/

• set password

# userdbpw | userdb "testuser@example.com" set systempw

it will prompt you for a password

• rebuild userdb

# makeuserdb

/etc/courier/userdb.dat will be updated

• reload services

# service courier-authdaemon restart
 * Stopping Courier authentication services authdaemond
   ...done.
 * Starting Courier authentication services authdaemond
   ...done.

Notify the user their account is ready. Note that their username is their FULL email address.