Use the Get-TransportRuleAction cmdlet to view the actions that are available for transport rules (mail flow rules).
For information about the parameter sets in the Syntax section below, see Exchange cmdlet syntax (https://docs.microsoft.com/powershell/exchange/exchange-server/exchange-cmdlet-syntax).
Get-TransportRuleAction [[-Name] <String>] [<CommonParameters>]
In on-premises Exchange, the actions that are available on Mailboxes servers and Edge Transports server are different. Also, the names of some of the actions that are returned by this cmdlet are different than the corresponding parameter names in the New-TransportRule and Set-TransportRule cmdlets.
You need to be assigned permissions before you can run this cmdlet. Although this topic lists all parameters for the cmdlet, you may not have access to some parameters if they're not included in the permissions assigned to you. To find the permissions required to run any cmdlet or parameter in your organization, see Find the permissions required to run any Exchange cmdlet.
This example returns a summary list of all actions.
Get-TransportRuleAction -Name DeleteMessage | Format-List
This example retrieves detailed information about the action named DeleteMessage.
The Name parameter specifies the name of the action that you want to view. To see the list of available names, run the command Get-TransportRuleAction.
|Accept pipeline input:||False|
|Accept wildcard characters:||False|
|Applies to:||Exchange Server 2010, Exchange Server 2013, Exchange Server 2016, Exchange Server 2019, Exchange Online, Exchange Online Protection|
To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn't accept input data.
To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn't return data.