The reason for the problem: 5.3.0 - Other mail system problem 550-'5.1.1 User unknown'

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  Hello,
  
  #I have an exchange 2013 cluster environment and identified that are returning from valid accounts rejections, I use acceptdomains as InternalRelay and have set the AddressBookEnabled true:

  AddressBookEnabled       : True
  DomainName               : mydomains.com.br
  DomainType               : InternalRelay

  #I'm getting these bounces valid accounts:

  The following message to <ti@mydomain.com.br> was undeliverable.

  The reason for the problem:

  5.3.0 - Other mail system problem 550-'5.1.1 User unknown'

  Reporting-MTA: dns; MYSPAMSERVER.embratelmail.com.br
  
  Final-recipient: RFC822; ti@mydomain.com.br
  Action: failed
  Status: 5.0.0
  Remote-MTA: dns; [172.17.0.45]
  X-Supplementary-Info: <[172.17.0.45] #5.0.0 smtp; 5.3.0 - Other mail system
   problem 550-'5.1.1 User unknown' (delivery attempts: 0)>

  #I use only 2 exchange native spam settings that are installed on mailbox servers .:

  PS E:\> Get-SenderFilterConfig
  
  
  Name                         : SenderFilterConfig
  BlockedSenders               : {<>}
  BlockedDomains               : {}
  BlockedDomainsAndSubdomains  : {}
  Action                       : Reject
  BlankSenderBlockingEnabled   : True
  RecipientBlockedSenderAction : Delete
  Enabled                      : True
  ExternalMailEnabled          : True
  InternalMailEnabled          : True
  
  
  PS E:\> Get-RecipientFilterConfig
  
  
  Name                       : RecipientFilterConfig
  BlockedRecipients          : {<>}
  RecipientValidationEnabled : True
  BlockListEnabled           : True
  Enabled                    : True
  ExternalMailEnabled        : True
  InternalMailEnabled        : True

  #I use separated function, CAS e MAILBOX. I don't use Edge Transport.
  

  #I realized that the answers of bad bounces are the CAS and not the Mailbox Server.

  My configs:

  & $env:ExchangeInstallPath\Scripts\Install-AntiSpamAgents.ps1
  
  $servers = "EXMBX01","EXMBX02","EXMBX03","EXMBX04","EXMBX05","EXMBX06"
  Invoke-Command -ScriptBlock {
  Restart-Service MSExchangeTransport
  Write-Host  "Restart-Service MSExchangeTransport Finished..." 
  } -ComputerName $servers
  
  Set-TransportConfig -InternalSMTPServers @{Add="10.100.11.35","10.100.11.36","10.100.11.37","10.100.11.38","10.100.11.39","10.100.11.40"}
  Get-TransportConfig | Format-List InternalSMTPServers
  #Blocking message with blank senders
  Set-SenderFilterConfig -BlankSenderBlockingenabled $true
  Set-SenderFilterConfig -BlockedSenders @{Add="<>"}
  Set-RecipientFilterConfig -BlockedRecipients @{Add="<>"}
  #Enable LDAP
  Set-RecipientFilterConfig -RecipientValidationEnabled $true
  Any idea?
  Thanks.

  
  
  
  

  • Edited by EvandroSemedo Monday, August 29, 2016 1:33 PM

  Monday, August 29, 2016 12:57 PM