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javax.mail.NoSuchProviderException: Invalid protocol: null	at javax.mail.Session.getProvider(Session.java:265)	at javax.mail.Session.getStore(Session.java:363)	at javax.mail.Session.getStore(Session.java:343)	at javax.mail.Session.getStore(Session.java:329)	at simplemail.send(simplemail.java:17)	at simplemail.main(simplemail.java:35)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)