Get-ExchangeDistributionGroupMemberReport

Exchange: Generates a detailed membership report for a Distribution Group

Script

#Requires -Version 5.1

[CmdletBinding()]
Param (
    [Parameter(Mandatory = $true)]
    [string]$Identity,

    [switch]$Recursive
)

Process {
    try {
        $group = Get-DistributionGroup -Identity $Identity -ErrorAction Stop
        
        function Get-ExchangeMembers {
            param($GroupId, $Depth = 0)
            $rawMembers = Get-DistributionGroupMember -Identity $GroupId -ErrorAction SilentlyContinue
            foreach ($member in $rawMembers) {
                $isGroup = $member.RecipientType -match 'Group'
                
                [PSCustomObject]@{
                    DisplayName       = $member.DisplayName
                    PrimarySmtpAddress = $member.PrimarySmtpAddress
                    RecipientType     = $member.RecipientType
                    Depth             = $Depth
                    ParentGroup       = $GroupId
                }

                if ($Recursive -and $isGroup) {
                    Get-ExchangeMembers -GroupId $member.DistinguishedName -Depth ($Depth + 1)
                }
            }
        }

        $results = Get-ExchangeMembers -GroupId $group.DistinguishedName
        Write-Output ($results | Sort-Object DisplayName -Unique)
    }
    catch {
        throw
    }
}

Customize

Identity string

Specifies the Identity of the distribution group.

Recursive switch

Off

If set, recursively expands nested groups to show all effective members.