Error while sending email notification from graylog3

I used graylog3,i configured notification to send to my corporate email ,also, i

1-Telnet SMTP service:

[root@csvapinfo01 graylog-server]# telnet 10.203.101.80  25
Trying 10.203.101.80...
Connected to 10.203.101.80.
Escape character is '^]'.
220 CAINCCAS02.EG01.Etisalat.net Microsoft ESMTP MAIL Service ready at Mon, 
1 Jul 2019 16:43:37 +0200\
    HELP
    214-This server supports the following commands:
    214 HELO EHLO STARTTLS RCPT DATA RSET MAIL QUIT HELP AUTH BDAT

2-Configured graylog3 configuration file as below:

transport_email_enabled = true
transport_email_hostname =10.203.101.80
transport_email_port =25
#transport_email_use_auth = true
#transport_email_auth_username = you@example.com
#transport_email_auth_password = secret
transport_email_subject_prefix = [graylog]
transport_email_from_email =ITDWH.AutoReports@etisalat.com
transport_email_use_tls = false
transport_email_use_ssl = false

But , i received below error:

2019-07-01T16:22:21.066+02:00 ERROR [EmailAlarmCallback] Alarm callback has email recipients and is triggered, but sending emails failed
org.apache.commons.mail.EmailException: Sending the email to the following server failed : 10.203.101.80:25
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1469) ~[graylog.jar:?]
        at org.apache.commons.mail.Email.send(Email.java:1496) ~[graylog.jar:?]
        at org.graylog2.alerts.FormattedEmailAlertSender.sendEmail(FormattedEmailAlertSender.java:202) ~[graylog.jar:?]
        at org.graylog2.alerts.FormattedEmailAlertSender.sendEmails(FormattedEmailAlertSender.java:227) ~[graylog.jar:?]
        at org.graylog2.alerts.FormattedEmailAlertSender.sendEmails(FormattedEmailAlertSender.java:162) ~[graylog.jar:?]
        at org.graylog2.alarmcallbacks.EmailAlarmCallback.call(EmailAlarmCallback.java:105) [graylog.jar:?]
        at org.graylog2.rest.resources.alarmcallbacks.AlarmCallbacksResource.test(AlarmCallbacksResource.java:150) [graylog.jar:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_77]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_77]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_77]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) [graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) [graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [graylog.jar:?]
        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [graylog.jar:?]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [graylog.jar:?]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [graylog.jar:?]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [graylog.jar:?]
        at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384) [graylog.jar:?]
        at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224) [graylog.jar:?]
        at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:181) [graylog.jar:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_77]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_77]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.1 Client was not authenticated

        at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2267) ~[graylog.jar:?]
        at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1758) ~[graylog.jar:?]
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1257) ~[graylog.jar:?]
        at javax.mail.Transport.send0(Transport.java:255) ~[graylog.jar:?]
        at javax.mail.Transport.send(Transport.java:124) ~[graylog.jar:?]
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1459) ~[graylog.jar:?]
        ... 33 more

Hi!

It seems, your mail server requires an authentification.

Try using these lines:

#transport_email_use_auth = true
#transport_email_auth_username = you@example.com
#transport_email_auth_password = secret

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