Java郵件錯誤：550 SMTP認證

Question

我有關於發送電子郵件的Java的SSL證書以下錯誤：

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 

我一直在使用InstallCert.java生成的證書，現在我得到以下錯誤：

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) 

任何人都知道我應該如何解決這個問題？ 謝謝

Answer 1

如JavaMail FAQ中所述，您需要向服務器進行身份驗證。除了FAQ中的示例外，您還可以使用Transport.send method that takes a username and password。

Answer 2

而是這行：

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

我不得不用這樣的：

transport.connect(null,smtpUser,smtpPassword); 

因此，通過以下方式，我可以發送電子郵件沒有錯誤：

  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!");