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Answers

The anchor a tag in Struts2 as well as the other tags could be parametrized with the param tag. Just place param tag in the body of the anchor tag. For example

<s:a action="myaction"><s:param name="myparam" value="%{property}"/></s:a> 

Create it like any other parameterized link.

Personally, I prefer to use JSP EL:

<a target="_blank" rel="nofollow" href="displayMails?foo=${someActionProperty}">${subject}</a>

But if you insist on tags:

<a target="_blank" rel="nofollow" href="displayMails?foo=<s:property value='%{someActionProperty}'/>">
  <s:property value="%{subject}"/>
</a>

… To use the S2 action name in the HREF.

<a target="_blank" rel="nofollow" href="<s:url action='displayMails'/>?foo=${someActionProperty}">${subject}</a>

At this point we’re back to having no idea why the S2 tag isn’t what you actually want.