Get members of a distribution group and include nested groups

enum-distgroup.ps1

# Code written by Copilot - no guarantees
# Function to get members of a distribution group, including nested groups

function Get-DistributionGroupMembers {

  param (

    [string]$GroupName

  )



  # Get the distribution group

  $group = Get-DistributionGroup -Identity $GroupName



  # Initialize an array to hold all members

  $allMembers = @()



  # Function to recursively get members

  function Get-Members {

    param (

      [string]$GroupName

    )



    # Get the members of the group

    $members = Get-DistributionGroupMember -Identity $GroupName



    foreach ($member in $members) {

      if ($member.RecipientType -eq 'MailUniversalDistributionGroup' -or $member.RecipientType -eq 'MailUniversalSecurityGroup') {

        # If the member is a distribution group, call the function recursively

        Get-Members -GroupName $member.Name

      } else {

        # Add the member to the array

        $allMembers += $member

      }

    }

  }



  # Start the recursive function

  Get-Members -GroupName $GroupName



  # Return all members

  return $allMembers

}



# Example usage

$groupName = "YourDistributionGroupName"

$members = Get-DistributionGroupMembers -GroupName $groupName



# Output the members

$members | ForEach-Object { Write-Output $_.Name }