title: Amazon SNS sending confirmation that SMS text message was sent with Ruby SDK
body: <p>I'm sending SMS text messages using Amazon SNS with Ruby Amazon SDK. As far I understood, the method <code>Aws::SNS::Client#publish</code> just enqueues the message sending. </p>
  
  <blockquote>
    <p>When a messageId is returned, the message has been saved and Amazon SNS will attempt to deliver it to the topic's subscribers shortly.</p>
  </blockquote>
  
  <p>I'd to know if the <code>publish</code> method just enqueues the sending and if so, is there any way to confirm with the SDK that the message was successfully sent?</p>