Hi

I ran "get-healthreport" and got an unhealthy "Frontend Transport". I found out the problem is the monitor "OnPremisesSmtpClientSubmissionMonitor". I found this event:

The client submission probe failed 3 times over 15 minutes.
Server 127.0.0.1 on port 587 did not respond with expected response (OK). The actual response was: 550 5.7.1 Client does not have permissions to send as this sender
.
Probe Exception: 'System.Exception: Server 127.0.0.1 on port 587 did not respond with expected response (OK). The actual response was: 550 5.7.1 Client does not have permissions to send as this sender
.
   at Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.AssertExpectedResponse(SmtpExpectedResponse expectedResponse)
   at Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.TestConnection()
   at Microsoft.Forefront.Monitoring.ActiveMonitoring.Smtp.Probes.SmtpConnectionProbe.DoWork(CancellationToken cancellationToken)
   at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.Execute(CancellationToken joinedToken)
   at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.<>c__DisplayClass2.<StartExecuting>b__0()
   at System.Threading.Tasks.Task.Execute()'
Failure Context: 'Server 127.0.0.1 on port 587 did not respond with expected response (OK). The actual response was: 550 5.7.1 Client does not have permissions to send as this sender
.'
Execution Context: ''
Probe Result Name: 'OnPremisesSmtpClientSubmission'
Probe Result Type: 'Failed'
Monitor Total Value: '3'
Monitor Total Sample Count: '3'
Monitor Total Failed Count: '0'
Monitor Poisoned Count: '0'
Monitor First Alert Observed Time: '3/13/2015 11:56:16 AM'

But I can telnet the port 487 on 127.0.0.1 and the last run seems to be fine. I have restarted the Frontend transport service with no luck. The state is still "Unhealthy".

RunspaceId              : b49aab67-784f-464f-9c60-4b07fcde8f6e
Server                  : srvexchange01
CurrentHealthSetState   : Online
Name                    : OnPremisesSmtpClientSubmissionMonitor
TargetResource          :
HealthSetName           : FrontendTransport
HealthGroupName         : ServiceComponents
AlertValue              : Unhealthy
FirstAlertObservedTime  : 13.03.2015 12:56:16
Description             :
IsHaImpacting           : False
RecurranceInterval      : 450
DefinitionCreatedTime   : 17.03.2015 14:47:56
HealthSetDescription    :
ServerComponentName     : FrontendTransport
LastTransitionTime      : 13.03.2015 12:56:16
LastExecutionTime       : 17.03.2015 15:49:53
LastExecutionResult     : Succeeded
ResultId                : 1671349
WorkItemId              : 70
IsStale                 : False
Error                   :
Exception               :
IsNotified              : False
LastFailedProbeId       : 37
LastFailedProbeResultId : 835260
ServicePriority         : 2
Identity                : FrontendTransport\OnPremisesSmtpClientSubmissionMonitor\
IsValid                 : True
ObjectState             : New