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java.net.UnknownHostException: mailhost at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at sun.net.NetworkClient.doConnect(Unknown Source) at sun.net.NetworkClient.openServer(Unknown Source) at sun.net.smtp.SmtpClient.openServer(Unknown Source) at sun.net.smtp.SmtpClient.<init>(Unknown Source) at TechSupport.sendMail(TechSupport.java:83) at TechSupport.doPost(TechSupport.java:27) at javax.servlet.http.HttpServlet.service(HttpServlet.java:747) at javax.servlet.http.HttpServlet.service(HttpServlet.java:840) at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:140) at com.sun.web.core.InvokerServlet.service(InvokerServlet.java:169) at javax.servlet.http.HttpServlet.service(HttpServlet.java:840) at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:140) at com.sun.web.core.Context.handleRequest(Context.java:375) at com.sun.web.server.ConnectionHandler.run(ConnectionHandler.java:135)