<a href = http://SomeSite.ru/MailPage?name=fromVasia&path=somePath>mail1</a>

     <servlet>
         <servlet-name>MailServlet</servlet-name>
         <servlet-class>xx.yy.MailServlet</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>MailServlet</servlet-name>
         <url-pattern>/MailPage</url-pattern>
     </servlet-mapping>

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
        ...
        String name = req.getParameter("name");
        String path = req.getParameter("path");
        ...
    }

//тут сборка строки с параметрами письма
outTable.add("<tr>");
outTable.add("<td> <a href=\"/callmailslist?letterPath=" + letterPath + " \">" + MailName + "</a>" + "</td>" +
                    "<td>" + letterFrom + "</td>" +
                    "<td>" + letterSubject + "</td>" +
                    "<td>" + letterSentDate + "</td>" +
                    "<td>" + letterAttachments + "</td>");
outTable.add("</tr>");