Use the Get-Trust cmdlet to return external and forest trusts.
For information about the parameter sets in the Syntax section below, see Exchange cmdlet syntax (https://docs.microsoft.com/powershell/exchange/exchange-cmdlet-syntax).
Get-Trust [-DomainName <Fqdn>] [<CommonParameters>]
The Get-Trust cmdlet is used by the Exchange admin center in to populate fields that display recipient information.
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.
Get-Trust -DomainName Contoso.com
This example enumerates all trusts for the domain Contoso.com.
The DomainName parameter specifies that trusts returned are restricted to the domain name specified.
|Accept pipeline input:||False|
|Accept wildcard characters:||False|
|Applies to:||Exchange Server 2010, Exchange Server 2013, Exchange Server 2016, Exchange Server 2019|
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.