    'd2mailer' => array(
        'class' => 'vendor.dbrisinajumi.d2mailer.D2mailerModule',
        'fromEmail' => 'uldis@weberp.lv',
        'fromName' => 'Uldis Nelsons',
        'smtp_host' => 'smtp.apollo.lv',
        'smtp_port' => 25,
        'smtp_username' => 'username', //optional
        'smtp_password' => 'password', //optional
    ),

Usage

    $user_id = 1;
    $subject = 'Subject';
    $message = 'Message';

    Yii::import('vendor.dbrisinajumi.d2mailer.components.*');
    $d2mailer = new d2mailer();     
    if($d2mailer->sendMailToUser($user_id,$subject,$message) === false){
        echo '     ' . $d2mailer->error;
    }