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Download Roundcube 1.5.x to the web htdocs directory and extract it (here rc/):

# Check for a newer release!
cd data/web
wget -O - | tar xfvz -
# Change folder name
mv roundcubemail-1.5-rc rc
# Change permissions
chown -R root: rc/

If you need spell check features, create a file data/hooks/phpfpm/ with the following content, then chmod +x data/hooks/phpfpm/ This installs a local spell check engine.

apk update
apk add aspell-en # or any other language

Create a file data/web/rc/config/ with the following content.

Change the des_key parameter to a random value. It is used to temporarily store your IMAP password. The "db_prefix" is optional but recommended.

if (!file_exists('/tmp/mime.types')) {
file_put_contents("/tmp/mime.types", fopen("", 'r'));
$config = array();
$config['db_dsnw'] = 'mysql://' . getenv('DBUSER') . ':' . getenv('DBPASS') . '@mysql/' . getenv('DBNAME');
$config['default_host'] = 'tls://dovecot';
$config['default_port'] = '143';
$config['smtp_server'] = 'tls://postfix';
$config['smtp_port'] = 587;
$config['smtp_user'] = '%u';
$config['smtp_pass'] = '%p';
$config['support_url'] = '';
$config['product_name'] = 'Roundcube Webmail';
$config['des_key'] = 'yourrandomstring_changeme';
$config['log_dir'] = '/dev/null';
$config['temp_dir'] = '/tmp';
$config['plugins'] = array(
$config['spellcheck_engine'] = 'pspell';
$config['mime_types'] = '/tmp/mime.types';
$config['imap_conn_options'] = array(
  'ssl' => array('verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true)
$config['enable_installer'] = true;
$config['smtp_conn_options'] = array(
  'ssl' => array('verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true)
$config['db_prefix'] = 'mailcow_rc1';

Point your browser to https://myserver/rc/installer and follow the instructions. Initialize the database and leave the installer.

Delete the directory data/web/rc/installer after a successful installation!

Configure ManageSieve filtering

Open data/web/rc/plugins/managesieve/ and change the following parameters (or add them at the bottom of that file):

$config['managesieve_port'] = 4190;
$config['managesieve_host'] = 'tls://dovecot';
$config['managesieve_conn_options'] = array(
  'ssl' => array('verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true)
// Enables separate management interface for vacation responses (out-of-office)
// 0 - no separate section (default),
// 1 - add Vacation section,
// 2 - add Vacation section, but hide Filters section
$config['managesieve_vacation'] = 1;

Enable change password function in Roundcube

Open data/web/rc/config/ and enable the password plugin:

$config['plugins'] = array(

Open data/web/rc/plugins/password/password.php, search for case 'ssha': and add above:

        case 'ssha256':
            $salt = rcube_utils::random_bytes(8);
            $crypted = base64_encode( hash('sha256', $password . $salt, TRUE ) . $salt );
            $prefix  = '{SSHA256}';

Open data/web/rc/plugins/password/ and change the following parameters (or add them at the bottom of that file):

$config['password_driver'] = 'sql';
$config['password_algorithm'] = 'ssha256';
$config['password_algorithm_prefix'] = '{SSHA256}';
$config['password_query'] = "UPDATE mailbox SET password = %P WHERE username = %u";

Integrate CardDAV addressbooks in Roundcube

Download the latest release of RCMCardDAV to the Roundcube plugin directory and extract it (here rc/plugins):

cd data/web/rc/plugins
wget -O -  | tar xfvz -
chown -R root: carddav/

Copy the file to (here in rc/plugins/carddav) and append the following preset to the end of the file - don't forget to replace with your own hostname:

$prefs['SOGo'] = array(
    'name'         =>  'SOGo',
    'username'     =>  '%u',
    'password'     =>  '%p',
    'url'          =>  '',
    'carddav_name_only' => true,
    'use_categories' => true,
    'active'       =>  true,
    'readonly'     =>  false,
    'refresh_time' => '02:00:00',
    'fixed'        =>  array( 'active', 'name', 'username', 'password', 'refresh_time' ),
    'hide'        =>  false,
Please note, that this preset only integrates the default addressbook (the one that's named "Personal Address Book" and can't be deleted). Additional addressbooks are currently not automatically detected but can be manually added within the roundecube settings.

Enable the plugin by adding carddav to $config['plugins'] in rc/config/

If you want to remove the default addressbooks (stored in the Roundcube database), so that only the CardDAV addressbooks are accessible, append $config['address_book_type'] = ''; to the config file data/web/rc/config/

Optionally, you can add Roundcube's link to the mailcow Apps list. To do this, open or create data/web/inc/ and add the following code-block:

NOTE: Don't forget to add the <?php delimiter on the first line

$MAILCOW_APPS = array(
    'name' => 'SOGo',
    'link' => '/SOGo/'
    'name' => 'Roundcube',
    'link' => '/rc/'
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