Use email domain as property filter.js

 <!-- begin Wootric code -->
<script type="text/javascript">
  wootric_survey_immediately = true; //TODO:comment this in production
  window.wootricSettings = {
    email:'nps@example.com', //TODO: Required to uniquely identify a user. Email is recommended but this can be any unique identifier.
    created_at: 1234567890, //TODO:replace it with date when your customer signed up           
    account_token: 'NPS-XXXX', //TODO:replace it with your account token       
    properties: {} //Make sure you initialize it, with or without values.
  };    
</script>
<script type="text/javascript" src="https://cdn.wootric.com/wootric-sdk.js"></script>

<script type="text/javascript">
  var email_domain = wootrcSettings.email.split('@');
  if (email_domain) {
    window.wootricSettings.properties.email_domain = email_domain[1];
  }
</script>
<script>window.wootric("run")</script>
<!-- end Wootric code -->