嗨，我的代码运行完美的几天前，我今天检查有给予我错误，而使用亚马逊ses服务发送电子邮件
在“https://email.us-west-2.amazonaws.com“上执行“发送电子邮件”时出错;AWS HTTP错误：客户端错误：POST https://email.us-west-2.amazonaws.com导致403 Forbidden响应：发件人签名完成（已截断...）签名不匹配（客户端）：签名过期日期：20160718 T125547 Z现在早于20160718 T125616 Z（20160718 T130116 Z- 5分钟）-发件人签名不匹配签名已过期：20160718 T125547 Z现在早于20160718 T125616 Z（20160718 T130116 Z- 5分钟）b64 acacc-4ce 7 - 11 e6-adb 5 - 0992 ceb 0921 c
我的密码是：

require_once("aws/aws-autoloader.php");
use Aws\Ses\SesClient;

define('SENDER', 'no-reply@example.net');

    define('RECIPIENT', 'my@example.com');    
    define('REGION','us-west-2');

    $client = SesClient::factory(array(
        'version'=> 'latest',     
        'region' => REGION,
        'credentials' => array(
            'key'    => '******************',
            'secret' => '*****************************',
        )
    ));

    $request = array();
    $request['Source'] = SENDER;
    $request['Destination']['ToAddresses'] = array(RECIPIENT);
    $request['Message']['Subject']['Data'] = $subject;
    $request['Message']['Body']['Text']['Data'] = $message;

    try {
         $result = $client->sendEmail($request);
         $messageId = $result->get('MessageId');

    } catch (Exception $e) {
        echo($e->getMessage()."\n");

    }

我该怎么补救呢？