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Message: [QUOTE="Federico, post: 530789"] Thank to both Joseph and Gary, but it's still not working. The smtp.jar is in the classpath, as the mail.jar and even the activation.jar. I've tried with the Gary's suggestions in the code, but it's still not working. What could be!??!?!?!? Now is even changed the errore message: DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc] java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:274) at javax.mail.Session.getService(Session.java:607) at javax.mail.Session.getTransport(Session.java:541) at javax.mail.Session.getTransport(Session.java:484) at javax.mail.Session.getTransport(Session.java:464) at sendMail.sendMail.<init>(sendMail.java:43) at sendMail.simpleSendMessage.main(simpleSendMessage.java:50) Caused by: java.lang.NoSuchMethodError: javax.mail.Session.getDebugOut()Ljava/io/PrintStream; at com.sun.mail.smtp.SMTPTransport.<init>(SMTPTransport.java:72) ... 10 more javax.mail.NoSuchProviderException: smtp at javax.mail.Session.getService(Session.java:611) at javax.mail.Session.getTransport(Session.java:541) at javax.mail.Session.getTransport(Session.java:484) at javax.mail.Session.getTransport(Session.java:464) at sendMail.sendMail.<init>(sendMail.java:43) at sendMail.simpleSendMessage.main(simpleSendMessage.java:50) Exception in thread "main" [/QUOTE]

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