Very slow mail flow

I recently had an Exchange 2010 server fail and I have replaced it with a completely new Exchange 2013 server running on Server 2012 R2. I have been getting complaints that mail flow can be extremely slow. And by slow I mean it could be a day or more before
the recipient receives the message. And this is mail being sent from one user in our organization to another user in our organization. Can anyone think of why this is happening and I need to do to fix it?

Here is the list of items that came back either Unhealthy or Disabled
[PS] C:\Windows\system32>Get-ServerHealth -Identity Server
Server          State           Name                 TargetResource      
HealthSetName   AlertValue ServerComp
onent
Server        NotApplicable   ActiveSyncCTPMonitor ActiveSync           ActiveSync      Unhealthy  None
Server        NotApplicable   AutodiscoverCtpMo... Server.USD108.l... Autodiscover    Unhealthy  None
Server        NotApplicable   AutodiscoverSelfT... MSExchangeAutoDis... Autodiscover... Unhealthy  None
Server        NotApplicable   ActiveSyncDeepTes... ActiveSync           ActiveSync.P... Unhealthy  None
Server        Offline         AutodiscoverProxy... MSExchangeAutodis... Autodiscover... Unhealthy  AutoDis...
Server        Offline         ActiveSyncProxyTe... MSExchangeSyncApp... ActiveSync.P... Unhealthy  ActiveS...
Server        Offline         EWSProxyTestMonitor  MSExchangeService... EWS.Proxy       Unhealthy  EwsProxy
Server        Offline         OutlookMapiHttpPr... MSExchangeMapiFro... OutlookMapiH... Unhealthy  MapiProxy
Server        Offline         OABProxyTestMonitor  MSExchangeOABAppPool OAB.Proxy       Unhealthy  OabProxy
Server        Offline         OutlookProxyTestM... MSExchangeRpcProx... Outlook.Proxy   Unhealthy  RpcProxy
Server        NotApplicable   EWSDeepTestMonitor   Mailbox Database ... EWS.Protocol    Unhealthy  None
Server        NotApplicable   EWSSelfTestMonitor   MSExchangeService... EWS.Protocol    Unhealthy  None
Server        NotApplicable   EdiscoveryDeepTes...                      Ediscovery.P... Unhealthy  None
Server        NotApplicable   EWSCtpMonitor        Server.USD108.l... EWS             Unhealthy  None
Server        NotApplicable   MaintenanceFailur...                      ECP            
Unhealthy  None
Server        NotApplicable   MaintenanceFailur...                      FEP            
Unhealthy  None
Server        NotApplicable   MaintenanceFailur...                      OWA            
Unhealthy  None
Server        NotApplicable   DatabaseHealthCir... Mailbox Database ... DataProtection  Unhealthy  None
Server        Online          OnPremisesSmtpCli...                     
FrontendTran... Unhealthy  Fronten...
Server        Online          MessageCountMonitor  Transport            Transport      
Disabled   HubTran...
Server        NotApplicable   RpsCtpPSMonitor                           RPS            
Unhealthy  None
Server        Online          DeferredMessageCo... Transport            Transport       Disabled  
HubTran...
Server        NotApplicable   RpsDeepTestPSProx...                      RPS            
Unhealthy  None
Server        Online          AverageMessageCou... Transport            Transport       Disabled  
HubTran...
Server        Online          TotalMessageCount... Transport            Transport       Disabled  
HubTran...
Server        NotApplicable   OutlookRpcDeepTes...                      Outlook.Prot... Unhealthy  None
Server        Offline         UMCallRouterTestM...                      UM.CallRouter  
Unhealthy  UMCallR...
Server        Online          MessageCountExcee... Transport            Transport       Disabled  
HubTran...
Server        Online          MessageCountExcee... Transport            Transport       Disabled  
HubTran...
Server        NotApplicable   ComplianceOutlook...                      Compliance     
Unhealthy  None
Server        NotApplicable   OutlookRpcCtpMonitor                      Outlook        
Unhealthy  None
Server        NotApplicable   PassiveDatabaseAv... Mailbox Database ... Store           Disabled   None
Server        Online          AggregatedQueueMo...                     
Transport       Disabled   HubTran...
Server        NotApplicable   SearchMemoryOverT...                      Search         
Disabled   None
Server        NotApplicable   MailboxDeliveryAv...                      MailboxTrans... Unhealthy  None
Server        Online          Transport.NDRForU... HubTransport         HubTransport    Disabled   HubTran...
Server        Online          TransportLogGener...                     
HubTransport    Disabled   HubTran...
Server        Online          TransportCategori...                     
HubTransport    Disabled   HubTran...
Server        Online          FederatedDecrypti...                     
HubTransport    Disabled   HubTran...
Server        Online          TransportDelivery...                     
HubTransport    Disabled   HubTran...
Server        Online          TransportDelivery...                     
HubTransport    Disabled   HubTran...
Server        NotApplicable   TransportDelivery...                      MailboxTrans... Disabled  
None
Server        Online          IsMemberOfResolve...                     
HubTransport    Disabled   HubTran...
Server        Online          IsMemberOfResolve...                     
HubTransport    Disabled   HubTran...
Server        Online          Transport.DomainS... HubTransport         HubTransport    Disabled   HubTran...
Server        Online          Transport.DomainS... HubTransport         HubTransport    Disabled   HubTran...
Server        Online          TlsDomainClientCe... HubTransport         HubTransport    Disabled   HubTran...
Server        Online          Transport.DomainS... HubTransport         HubTransport    Disabled   HubTran...
Server        Online          Transport.DomainS... HubTransport         HubTransport    Disabled   HubTran...
Server        NotApplicable   TransportFedCertM... MSExchangeCertifi... MSExchangeCe... Disabled   None
Server        NotApplicable   TransportFedCertE... MSExchangeCertifi... MSExchangeCe... Disabled   None

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