In that case try this:
<mm:reated path="news,urls">
<a href="<mm:field name="urls.url"/>"><mm:field
name="news.title"></a>
</mm:related>
or
<mm:relatednodes type="news">
<%-- find the url --%>
<mm:relatednodes type="urls" max="1">
<mm:import id="url"><mm:field name="url"
escape="none"/></mm:import>
</mm:relatednodes>
<a href="<mm:write referid="url"/>"><mm:field name="title"/></a>
<mm:field name="html(intro,200,...)"/>
</mm:relatednodes>
<<winmail.dat>>
