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javax.mail.NoSuchProviderException: Invalid protocol:
 null	at javax.mail.Session.getProvider(Session.java:431)	at javax.mail.Session.getTransport(Session.java:650)	at javax.mail.Session.getTransport(Session.java:631)	at javax.mail.Session.getTransport(Session.java:617)	at MailDemo.main(MailDemo.java:25)