Get–TransportAgent

 Add-IPBlockListProvider -Name Spamhaus -LookupDomain zen.spamhaus.org -AnyMatch $true -Enabled $true -RejectionResponse "IP address is listed by Spamhaus"
 Set-IPBlockListProvider Spamhaus -RejectionResponse "IP address is listed by Spamhaus Zen."
  
 Add-IPBlockListProvider -Name SpamCop -LookupDomain bl.spamcop.net -AnyMatch $true -Enabled $true -RejectionResponse "IP address is listed by SpamCop"
 Set-IPBlockListProvider Spamhaus -RejectionResponse "IP address is listed by SpamCop." 

Get-IPBlockListProvider

하루나 이틀 지나고 실행

[PS] C:\Program Files\Microsoft\Exchange Server\V15\scripts>.\get-AntispamTopRBLProviders.ps1