DEBUG SMTP: MessagingException while sending, THROW: 
 com.sun.mail.smtp.SMTPSendFailedException: 503 Error: need EHLO and AUTH first !
 ;
 nested exception is:
 com.sun.mail.smtp.SMTPSenderFailedException: 503 Error: need EHLO and AUTH first !
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2374)
 at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1808)
 at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1285)
 at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:524)
 at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:444)
 at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:354)
 at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
 at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:806)
 at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:755)
 at hudson.model.Build$BuildExecution.cleanUp(Build.java:188)
 at hudson.model.Run.execute(Run.java:1935)
 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
 at hudson.model.ResourceController.execute(ResourceController.java:99)
 at hudson.model.Executor.run(Executor.java:432)
 Caused by: com.sun.mail.smtp.SMTPSenderFailedException: 503 Error: need EHLO and AUTH first !
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1817)
 ... 12 more
 Not sent to the following valid addresses: 452776965@qq.com
 SMTPSendFailedException message: 503 Error: need EHLO and AUTH first !
Next SMTPSenderFailedException message: 503 Error: need EHLO and AUTH first !