title: MoonMail Missing recipients using createRecipient endpoint
body: <p>I created 5,000 recipients in a list. These emails were <code>success+{uniqueInt}@simulator.amazonses.com</code> and <code>bounce+{uniqueInt}@simulator.amazonses.com</code>.</p>
  
  <p>For some unknown reason, only 4,135 emails were added. I found this using:</p>
  
  <p><code>aws dynamodb scan --table-name XXX-sentEmails --select "COUNT"
  </code></p>
  
  <p>I found no exceptions in the logs:</p>
  
  <pre><code>aws logs filter-log-events
          --log-group-name /aws/lambda/XX-createRecipient
          --filter-pattern Exception
          --output text
  </code></pre>
  
  <p>Any ideas what could happens? Can DynamoDB reject records silently?</p>