{%- assign authors=include.authors|split:"," -%}
{%- for author in authors -%}
  {%- if author contains "<" -%}
    {%- assign authorparts=author|split:"<" -%}
    <a href="mailto:{{authorparts[1]|remove:">"}}">{{authorparts[0]|strip}}</a>
  {%- else -%}
    {{author}}
  {%- endif -%}
  {% if forloop.last == false %}, {% endif %}
{%- endfor -%}