How do I copy allow and block lists from one EOP policy to another?

Question

We have set up one Spam Filter policy in Exchange Online Protection with our allow and block sender and domain lists and we have created a second policy that we want to have the same allow and block lists.

Is there a way to basically copy or import/export the allow and block lists from one policy to the other using powershell?

Answer 1

It took a while to figure this out, but yes. Each list can be copied directly in a single command.

The trick was that you have to "walk" the objects returned using ForEach-Object. These four commands will copy all four allow/block lists:

Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -AllowedSenders $_.AllowedSenders}
Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -AllowedSenderDomains $_.AllowedSenderDomains}
Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -BlockedSenders $_.BlockedSenders}
Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -BlockedSenderDomains $_.BlockedSenderDomains}

Answer 2

Just in case anyone has the requirement to clone EOP allow/block lists and stumbled upon this post as I did.

Not sure if there is a change to the cmdlets, however, using array dot references to get the commands to work.

ie:$_.AllowedSenders.Sender

Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -AllowedSenders $_.AllowedSenders.Sender}
Get-HostedContentFilterPolicy -Identity <source policy> | ForEach-Object {Set-HostedContentFilterPolicy -Identity <destination policy> -AllowedSenderDomains $_.AllowedSenderDomains.Domain}