email-amazon/DMS/docker-data/roundcube/plugins/email_config/config/config.inc.php

<?php

$config['language'] = 'en_US';

$config['smtp_server'] = 'ssl://mailserver';
$config['smtp_port']   = 465;

$config['smtp_conn_options'] = array(
    'ssl' => array(
        'verify_peer'       => false,
        'verify_peer_name'  => false,
        'allow_self_signed' => true,
    ),
);