SMTPSendFailedException 530 in Gmail , SMTP fails whereas IMAP works.
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I have a sample gmail client class. In that class I initialize BOTH IMAPS & SMTPS sessions.
For some time it was working fine. But now Gmail throws SMTO Send Fail Exception.

Followed Instructions on this URL but no solution.
http://support.google.com/mail/bin/answer.py?answer=14257


    com.sun.mail.smtp.SMTPSendFailedException: 530-5.5.1 Authentication Required. Learn more at
    530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257 of1sm3237685pbb.15
    
    	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.xxx.mail.direct.DirectMailBox.sendMail(DirectMailBox.java:86)
    	at com.xxx.test.DirectMailTest.testSendMail(DirectMailTest.java:40)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    	at java.lang.reflect.Method.invoke(Unknown Source)
    	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

