1. Check the installed and enabled AntiSpam agents on this server
Get-TransportAgent
2. Install and enable AntiSpam agents on Exchange HUB Transport Server
& “C:\Program Files\Microsoft\Exchange Server\V14\Scripts\install-AntispamAgents.ps1″
#You must restart MSExchangeTransport service, and close EMS and EMC to apply changes
3. Check AntiSpam updates configuration
Get-AntispamUpdates

4. Set zen.spamhaus.org as DNSBL (DNS-based Blackhole List) provider

ZEN combines SBL, SBLCSS, XBL and PBL into one single powerful blocklist


5. List DNSBL providers
Get-IPBlockListProvider

#Test DNSBL providers
Test-IPBlockListProvider -Identity SpamHAUS -IPAddress
Additional Block Lists
dnsbl.sorbs.net
bl.spamcop.net
dnsbl-1.uceprotect.net
#Agent Logs
C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\Logs\AgentLog
credit: http://netport.org/?p=1200



