Java Mail Error: 550 SMTP authentication

Question

I had the following error regarding the java SSL certificate for sending email:

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
... 23 more

I have generated a certificate using InstallCert.java and NOW i am getting the following error:

com.sun.mail.smtp.SMTPSendFailedException: 550 SMTP authentication mandatory

at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
at com.MailerPecUtility.sendMail(MailerPecUtility.java:201)
at com.MailerPecUtility.main(MailerPecUtility.java:266)

Anyone knows how should i resolve this ?? Thanks

Answer 1

As described in the JavaMail FAQ , you need to authenticate to your server. In addition to the example in the FAQ, you can use the Transport.send method that takes a username and password .

Answer 2

Instead of this line:

 transport.connect(specProps.getProperty("mail.smtp.host"), port, user, pass);

I had to use this:

 transport.connect( null,smtpUser,smtpPassword);

Therefore, by the following way, I could send the email without error:

         message.setText("The email body text");
         Transport transport = session.getTransport("smtp");
         transport.connect( null,smtpUser,smtpPassword);
         message.saveChanges();
         Transport.send(message);
         System.out.println("Message Has been sent!");