Can't send email from AWS - email

Question

my application is on aws EC2 it was sending email very well suddenly it started throwing exception
javax.mail.MessagingException'.
javax.mail.AuthenticationFailedException: 535 5.7.8 Error: authentication failed: authentication failure
at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:826)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:761)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:685)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at com.server.utils.EmailServicesImpl.sendMail(EmailServicesImpl.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:110)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.lang.Thread.run(Thread.java:745)
Here is my email settings
mail.smtp.auth=true
mail.smtp.starttls.enable=true
mail.smtp.host=smtp.mydomain.in
mail.smtp.port = 587
i tried with port 25 also but the problem is still same.

Answer 1

According to your setting, you require StartTLS. The default port for that is 587 which is fine; changing it to 25 will most definitely break it.
And your error message states authentication failed, so I'd suspect that you are either not providing credentials or the wrong ones.