- For Exchange 2007 Hub servers and later you first need to enable the anti-spam functionality by running
cd "c:\Program Files\Microsoft\Exchange Server\Scripts"and/install-AntispamAgents.ps1as described here and then go to Edge Transport (or Hub Transport as appropriate) > Anti-spam tab > Recipient Filtering and enable it as described here - For Exchange 2010, instructions are similar to 2007, go to properties > Blocked recipients and ensure "Block messages set to recipients that do not exist in the directory" is ticked as described here and here.
- For Exchange 2013, see here to enable Exchange anti-spam and then here and here to stop backscatter. The EMC command is "
Set-RecipientFilterConfig -Enabled $true"Set-RecipientFilterConfig -RecipientValidationEnabled:$true
Stopping Backscatter on Exchange servers
Modified on: Thu, 19 Apr, 2018 8:14 AM
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