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java.net.UnknownHostException: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:520) at java.net.Socket.connect(Socket.java:470) at java.net.Socket.<init>(Socket.java:367) at java.net.Socket.<init>(Socket.java:240) at com.sun.mail.util.SocketFetcher.getSocket0(SocketFetcher.java:253) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:129) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1195)