Export Distribution List Members PowerShell Script

Export-DLMembers.ps1

# Export-DLMembers.ps1
[CmdletBinding()]
param (
    [Parameter()]
    $DistributionList
)

if ($DistributionList) {
    try {
        $group = Get-DistributionGroup -Identity $DistributionList -ErrorAction Stop
    }
    catch {
        $_.Exception.Message | Out-Default
        return $null
    }
}
else {
    try {
        $group = Get-DistributionGroup -ResultSize Unlimited -ErrorAction Stop | Sort-Object DisplayName
    }
    catch {
        $_.Exception.Message | Out-Default
        return $null
    }
}

if ($group.Count -gt 0) {
    for ($i = 0; $i -lt $group.Count; $i++) {
        Write-Progress -Activity "Distribution List: $($group[$i].DisplayName)" -Status "$($i+1) of $($group.Count) " -PercentComplete (($($i + 1) / $($group.Count)) * 100)
        try {
            Get-DistributionGroupMember -ResultSize Unlimited -Identity $group[$i] -ErrorAction Stop |
            Select-Object @{n = "GroupGUID"; e = { $group[$i].GUID } },
            @{n = "GroupName"; e = { $group[$i].Name } },
            @{n = "GroupEmail"; e = { $group[$i].PrimarySmtpAddress } },
            @{n = "MemberGUID"; e = { $_.GUID } },
            @{n = "MemberName"; e = { $_.DisplayName } },
            @{n = "MemberEmail"; e = { $_.PrimarySmtpAddress } },
            @{n = "MemberType"; e = { $_.RecipientTypeDetails } }
        }
        catch {
            $_.Exception.Message | Out-Default
        }
    }
}