Magical Custom Fields : Email Notifications

custom-field-notifications.liquid

{% unless line.properties == empty %}
  {%- for prop in line.properties -%}
  <p>                     
      <span>{{ prop.first }}: </span>
      <span> {{ prop.last }}  </span>
  </p>  
  {%- endfor -%}
{% endunless %}

Insert in between:

{% for line in subtotal_line_items %}

{% endfor %}

in Shopify email templates.