discourse/app/assets/javascripts/admin/templates/modal/admin_incoming_email.hbs

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.error"}}</label>
  <div class="controls">
    <p>{{model.error}}</p>
    {{#if model.error_description}}
      <p class="error-description">{{model.error_description}}</p>
    {{/if}}
  </div>
</div>

<hr>

{{#if model.return_path}}
  <div class="control-group">
    <label>{{i18n "admin.email.incoming_emails.modal.return_path"}}</label>
    <div class="controls">
      {{model.return_path}}
    </div>
  </div>
{{/if}}

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.message_id"}}</label>
  <div class="controls">
    {{model.message_id}}
  </div>
</div>

{{#if model.references}}
  <div class="control-group">
    <label>{{i18n "admin.email.incoming_emails.modal.references"}}</label>
    <div class="controls">
      <ul>
        {{#each reference in model.references}}
          <li>{{reference}}</li>
        {{/each}}
      </ul>
    </div>
  </div>
{{/if}}

{{#if model.in_reply_to}}
  <div class="control-group">
    <label>{{i18n "admin.email.incoming_emails.modal.in_reply_to"}}</label>
    <div class="controls">
      {{model.in_reply_to}}
    </div>
  </div>
{{/if}}

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.date"}}</label>
  <div class="controls">
    {{date}}
  </div>
</div>

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.from"}}</label>
  <div class="controls">
    {{model.from}}
  </div>
</div>

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.to"}}</label>
  <div class="controls">
    <ul>
      {{#each to in model.to}}
        <li>{{to}}</li>
      {{/each}}
    </ul>
  </div>
</div>

{{#if model.cc}}
  <div class="control-group">
    <label>{{i18n "admin.email.incoming_emails.modal.cc"}}</label>
    <div class="controls">
      {{model.cc}}
    </div>
  </div>
{{/if}}

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.subject"}}</label>
  <div class="controls">
    {{model.subject}}
  </div>
</div>

<div class="control-group">
  <label>{{i18n "admin.email.incoming_emails.modal.body"}}</label>
  <div class="controls">
    {{textarea value=model.body}}
  </div>
</div>