To block certain domain's or IP Addresses from sending email into your organisation, use powershell and execute the following:
Set-IPBlockListConfig -Enabled:$True
Add-IPBlockListEntry -IPAddress 123.456.0.1
Add-IPBlockListEntry -IPRange 123.456.1.1-123.456.0.255
To remove IP Addresses from being blocked execute the following in powershell:
Remove-IPBlockListEntry
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