Mail is not sent using mandrill and response of status is queued in Laravel5

I am using mandrill API and integrate this with laravel-5 on localhost, m getting status as queued and check this mail is in mandrill dashbopard then It shows Rejected, What am I doing wrong, Please let me know.

$message = array(
            'html' => '<p>Example HTML content</p>',
            'text' => 'Example text content',
            'subject' => 'example subject',
            'from_email' => 'rajeevvarshney56@gmail.com',
            'from_name' => 'Rajeev Varshney',
            'to' => array(
                array(
                    'email' => 'rajeev.web@boltt.net',
                    'name' => 'Boltt Sports',
                    'type' => 'to'
                )
            ),
            'headers' => array('Reply-To' => 'message.reply@example.com'),
            'important' => false,
            'track_opens' => null,
            'track_clicks' => null,
            'auto_text' => null,
            'auto_html' => null,
            'inline_css' => null,
            'url_strip_qs' => null,
            'preserve_recipients' => null,
            'view_content_link' => null,
            'bcc_address' => 'message.bcc_address@example.com',
            'tracking_domain' => null,
            'signing_domain' => null,
            'return_path_domain' => null,
            'merge' => true,
            'merge_language' => 'mailchimp',
    //        'global_merge_vars' => array(
    //            array(
    //                'name' => 'merge1',
    //                'content' => 'merge1 content'
    //            )
    //        ),
    //        'merge_vars' => array(
    //            array(
    //                'rcpt' => 'recipient.email@example.com',
    //                'vars' => array(
    //                    array(
    //                        'name' => 'merge2',
    //                        'content' => 'merge2 content'
    //                    )
    //                )
    //            )
    //        ),
            'tags' => array('password-resets'),
            'subaccount' => 'rajeevvarshney',
            //'google_analytics_domains' => array('example.com'),
           // 'google_analytics_campaign' => 'message.from_email@example.com',
            'metadata' => array('website' => 'www.example.com'),
    //        'recipient_metadata' => array(
    //            array(
    //                'rcpt' => 'recipient.email@example.com',
    //                'values' => array('user_id' => 123456)
    //            )
    //        ),
            'attachments' => array(
                array(
                    'type' => 'text/plain',
                    'name' => 'myfile.txt',
                    'content' => 'ZXhhbXBsZSBmaWxl'
                )
            ),
            'images' => array(
                array(
                    'type' => 'image/png',
                    'name' => 'IMAGECID',
                    'content' => 'ZXhhbXBsZSBmaWxl'
                )
            )
        );
    //    $async = false;
        //$ip_pool = 'Main Pool';
        //$send_at = 'example send_at';
        $result = $mandrill->messages->send($message);

    Response 
    ----------

    Array
    (
        [0] => Array
            (
                [email] => rajeev.web@boltt.net
                [status] => queued
                [_id] => 2f3c2f9ec1034ac9bd66ccd91ad3fbe1
            )

    )

via Chebli Mohamed