SMTP Authentication error when trying to send emails in private cloud

[rymonroe]

I'm getting the below error when sending emails (forgot password) in Apigee Edge private cloud 4.15.07. I have confirmed there is no authentication on SMTP server used, below is from

apigee4/conf/ui/apigee.conf.

mail.smtp.host=<IP_TO_SMTP>
#mail.smtp.user=
#mail.smtp.pass=
#mail.smtp.channel=
mail.smtp.port=25
mail.smtp.tls="false"

        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at scala.Option.map(Option.scala:145) [org.scala-lang.scala-library-2.11.1.jar:na]
Caused by: utils.UiException: Internal Error
play.api.Application$$anon$1: Execution exception[[UiException: Internal Error]]
        at play.api.Application$class.handleError(Application.scala:296) ~[com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at play.api.DefaultApplication.handleError(Application.scala:402) [com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at scala.Option.map(Option.scala:145) [org.scala-lang.scala-library-2.11.1.jar:na]
Caused by: utils.UiException: Internal Error
        at utils.UiException.makeExceptionWithSteps(UiException.java:40) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
        at controllers.NonSecure$8.apply(NonSecure.java:456) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
        at controllers.NonSecure$8.apply(NonSecure.java:443) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
        at play.core.j.FPromiseHelper$$anonfun$map$1.apply(FPromiseHelper.scala:98) ~[com.typesafe.play.play_2.11-2.3.4.jar:2.3.4]
        at scala.util.Success$$anonfun$map$1.apply(Try.scala:236) ~[org.scala-lang.scala-library-2.11.1.jar:na]
Caused by: org.apache.commons.mail.EmailException: Sending the email to the following server failed : 10.26.74.190:25
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410) ~[org.apache.commons.commons-email-1.3.3.jar:1.3.3]
        at org.apache.commons.mail.Email.send(Email.java:1437) ~[org.apache.commons.commons-email-1.3.3.jar:1.3.3]
        at services.Mails.sendMail(Mails.java:128) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
        at services.Mails.sendMailPasswordReset(Mails.java:87) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
        at controllers.NonSecure$8.apply(NonSecure.java:453) ~[enterpriseui.enterpriseui-4.15.07.00-75d1384-20150823-004603.jar:4.15.07.00-75d1384-20150823-004603]
Caused by: javax.mail.AuthenticationFailedException: 535 5.7.0 authentication failed

        at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:823) ~[javax.mail.mail-1.4.5.jar:1.4.5]
        at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:756) ~[javax.mail.mail-1.4.5.jar:1.4.5]
        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:673) ~[javax.mail.mail-1.4.5.jar:1.4.5]
        at javax.mail.Service.connect(Service.java:317) ~[javax.mail.mail-1.4.5.jar:1.4.5]
        at javax.mail.Service.connect(Service.java:176) ~[javax.mail.mail-1.4.5.jar:1.4.5]
utils.UiException: Internal Error
        at utils.UiException.makeExceptionWithSteps(UiException.java:40)
        at controllers.NonSecure$8.apply(NonSecure.java:456)
        at controllers.NonSecure$8.apply(NonSecure.java:443)
        at play.core.j.FPromiseHelper$$anonfun$map$1.apply(FPromiseHelper.scala:98)
        at scala.util.Success$$anonfun$map$1.apply(Try.scala:236)
        at scala.util.Try$.apply(Try.scala:191)
        at scala.util.Success.map(Try.scala:236)
        at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
        at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
        at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
        at play.core.j.HttpExecutionContext$$anon$2.run(HttpExecutionContext.scala:40)
        at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
        at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.commons.mail.EmailException: Sending the email to the following server failed : 10.26.74.190:25
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
        at org.apache.commons.mail.Email.send(Email.java:1437)
        at services.Mails.sendMail(Mails.java:128)
        at services.Mails.sendMailPasswordReset(Mails.java:87)
        at controllers.NonSecure$8.apply(NonSecure.java:453)
        ... 15 more
Caused by: javax.mail.AuthenticationFailedException: 535 5.7.0 authentication failed

        at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:823)
        at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:756)
        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:673)
        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 org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
        ... 19 more
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