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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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via Oracle Community by Praveen Gaur, 1 year ago
java.net.UnknownHostException: mail	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:579)	at java.net.Socket.connect(Socket.java:528)	at java.net.Socket.(Socket.java:425)	at java.net.Socket.(Socket.java:208)	at intradoc.common.SmtpClient.sendMail(SmtpClient.java:275)	at intradoc.server.InternetFunctions.sendMail(InternetFunctions.java:445)	at intradoc.server.InternetFunctions.sendMailToEx(InternetFunctions.java:363)	at intradoc.server.InternetFunctions.sendMailTo(InternetFunctions.java:83)	at intradoc.server.InternetFunctions.sendMailPackage(InternetFunctions.java:724)	at intradoc.server.InternetFunctions$1.run(InternetFunctions.java:629)	at java.lang.Thread.run(Thread.java:744)