CRM 2015 - Server Side Synchronization - Incoming email from comcast.net domain not creating Email Activity

Hi,

I am having Server Side Sync, enabled for Queue. SSS works fine as long as it is receiving emails from .com domains. However it is giving following error while processing email that is sent from comcast.net domain. Emails are not getting created as Activities in CRM

There is no Custom Plug-in or Workflow running on email entity in CRM. There are no 2 queues with same email address.

>Crm Exception: Message: Bad Conversation Index, ErrorCode: -2147220970
[2016-03-28 15:14:31.542] Process:CrmAsyncService |Organization:f81b30cf-7cd2-e111-b664-005056ab021d |Thread:   74 |Category: Platform.Sdk |User: 46e15091-f11b-412d-b003-124b24a4fbf5 |Level: Error |ReqId: 00000000-0000-0000-0000-000000000000 | VersionedPluginProxyStepBase.Execute  ilOffset = 0x65
	at VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context)  ilOffset = 0x65
	at PipelineInstrumentationHelper.Execute(Boolean instrumentationEnabled, String stopwatchName, ExecuteWithInstrumentation action)  ilOffset = 0x2D
	at Pipeline.Execute(PipelineExecutionContext context)  ilOffset = 0xD8
	at <>c__DisplayClass1.<RunStage>b__0()  ilOffset = 0x0
	at PipelineInstrumentationHelper.Execute(Boolean instrumentationEnabled, String stopwatchName, ExecuteWithInstrumentation action)  ilOffset = 0x2D
	at MessageProcessor.RunStage(PipelineExecutionContext context, Int32 pipelineStage)  ilOffset = 0x39
	at MessageProcessor.Execute(PipelineExecutionContext context)  ilOffset = 0x171
	at InternalMessageDispatcher.Execute(PipelineExecutionContext context)  ilOffset = 0xE4
	at ExternalMessageDispatcher.ExecuteInternal(IInProcessOrganizationServiceFactory serviceFactory, IPlatformMessageDispatcherFactory dispatcherFactory, String messageName, String requestName, Int32 primaryObjectTypeCode, Int32 secondaryObjectTypeCode, ParameterCollection fields, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId, Guid transactionContextId, Int32 invocationSource, Nullable`1 requestId, Version endpointVersion)  ilOffset = 0x16E
	at OrganizationSdkServiceInternal.ExecuteRequest(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, UserAuth userAuth, Guid targetUserId, OrganizationContext context, Boolean returnResponse, Boolean checkAdminMode)  ilOffset = 0x1EE
	at OrganizationSdkServiceInternal.ExecuteRequest(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, Boolean checkAdminMode)  ilOffset = 0x2D
	at OrganizationSdkServiceInternal.Execute(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, Boolean checkAdminMode)  ilOffset = 0x26
	at InprocessServiceProxy.ExecuteCore(OrganizationRequest request)  ilOffset = 0x34
	at IncomingEmailProviderBase.DeliverMessageInternal(EmailMessage emailMessage, Boolean validateBeforeCreate)  ilOffset = 0x207
	at IncomingEmailProviderBase.DeliverMessage(EmailMessage emailMessage, Boolean validateBeforeCreate)  ilOffset = 0x19
	at GetItemsStep.ProcessResponse()  ilOffset = 0x5AB
	at ExchangeIncomingEmailProviderStep.EndOperation()  ilOffset = 0xFC
	at ExchangeIncomingEmailProvider.ReceiveEmails()  ilOffset = 0x92
	at IncomingActivityProviderBase.Run()  ilOffset = 0x42
	at MailboxEmailOperation.PerformOperation()  ilOffset = 0x2C
	at MailboxOperationBase`1.Execute()  ilOffset = 0xAA
	at MailboxProcessingOperation.PerformOperation()  ilOffset = 0x1A
	at MailboxOperationBase`1.Execute()  ilOffset = 0xAA
	at MailboxOperationCommand.InternalExecute(MailboxAsyncEvent asyncEvent)  ilOffset = 0x64
	at AsyncCallbackHandler`2.ResumeExecution(IAsyncEvent asyncEvent)  ilOffset = 0x5B
	at AsyncEventExecutionManager`2.ExecuteHandler(IAsyncEventHandlerFactory handlerFactory)  ilOffset = 0xD9
	at PoolHandler.ProcessAsyncEvent(IAsyncEventExecutionManager asyncEventExecutionManager)  ilOffset = 0x144
	at AsyncEventOperation.<.ctor>b__2(IServiceOperation operation)  ilOffset = 0x0
	at FaultToleranceBehavior.Execute(ServiceOperationAction operation, IServiceOperation operationParameter)  ilOffset = 0x18
	at MonitoredOperation.Execute()  ilOffset = 0xD
	at ThreadPoolQueueExecutionEngine.InvokeNextOperationInThreadPool(Object state)  ilOffset = 0xC
	at ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)  ilOffset = 0x70
	at ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)  ilOffset = 0x4
	at QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()  ilOffset = 0x0
	at ThreadPoolWorkQueue.Dispatch()  ilOffset = 0xA3>Web Service Plug-in failed in SdkMessageProcessingStepId: {D0CABB1B-EA3E-DB11-86A7-000A3A5473E8}; EntityName: email; Stage: 30; MessageName: DeliverIncoming; AssemblyName: Microsoft.Crm.Extensibility.InternalOperationPlugin, Microsoft.Crm.ObjectModel, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; ClassName: Microsoft.Crm.Extensibility.InternalOperationPlugin; Exception: Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Web.Services.Protocols.LogicalMethodInfo.Invoke(Object target, Object[] values)
   at Microsoft.Crm.Extensibility.InternalOperationPlugin.Execute(IServiceProvider serviceProvider)
   at Microsoft.Crm.Extensibility.V5PluginProxyStep.ExecuteInternal(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context)
Inner Exception: Microsoft.Crm.CrmException: Bad Conversation Index
   at Microsoft.Crm.CrmException.Assert(Boolean condition, String message)
   at Microsoft.Crm.Common.ObjectModel.EmailService.AddAdditionalFields(Email email, Entity emailDeltaEntity, ExecutionContext context)
   at Microsoft.Crm.Common.ObjectModel.EmailService.SetRecipientsAddAdditionalAttributeAndCreate(AddressEntry[][] allResolvedAddressEntries, Email email, Entity emailDeltaEntity, String traceSubject, ExecutionContext context)
   at Microsoft.Crm.Common.ObjectModel.EmailService.Deliver(Boolean userPromote, Guid emailId, String messageId, String subject, String from, String to, String cc, String bcc, DateTime receivedOn, String submittedBy, String importance, String body, BusinessEntityCollection attachments, Guid campaignResponseId, Entity emailDeltaEntity, ExecutionContext context, Boolean validateBeforeDeliver)
   at Microsoft.Crm.Common.ObjectModel.EmailService.DeliverIncoming(String messageId, String subject, String from, String to, String cc, String bcc, DateTime receivedOn, String submittedBy, String importance, String body, BusinessEntityCollection attachments, Entity extraProperties, Boolean validateBeforeCreate, ExecutionContext context)
.

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