Configure Horde Groupware Webmail with Postfix and Dovecot

Follow these steps:

• Install Postfix. Postfix is a free, open source Mail Transfer Agent which works to route and deliver email. Before installing Postfix, you will need to have a Fully Qualified Domain Name pointing to the server that you will be using. On Ubuntu and similar systems, Postfix can be installed using the command apt-get install postfix. On CentOS systems, Postfix can be installed using the command yum install postfix.

• Once Postfix is installed, configure the following options in the /etc/postfix/main.cf file.

  myhostname = example.com
  ...
  home_mailbox = Maildir/
  

• Install Dovecot. Dovecot is a open source Mail Delivery Agent that works with IMAP and POP3. On Ubuntu and similar systems, Dovecot can be installed using the command apt-get install dovecot-imapd. On CentOS systems, Dovecot can be installed using the command yum -y install dovecot.

• Once Dovecot is installed, configure the following option in the /etc/dovecot/conf.d/10-mail.conf file:

  mail_location = maildir:~/Maildir
  

• To configure Horde with Postfix and Dovecot, modify the following options in the /opt/bitnami/apps/horde/htdocs/imp/config/backends.php file:

  $servers['imap'] = array(
      'disabled' => false,
      'name' => 'Postfix-Dovecot Server',
      'hostspec' => 'machine.example.com',
      'hordeauth' => false,
      'protocol' => 'imap',
      'port' => 143,
      'secure' => 'tls',
      'maildomain' => 'example.com',
      'smtp' => array(
          'auth' => true,
          'localhost' => 'localhost',
          'host' => 'machine.example.com',
          'password' => null,
          'port' => 25,
          'username' => null
      ),
      'cache' => false,
  );