Here is the script I wrote to gather all members from the DL and all the child DLs in it. Script requires you pass Exchange DL name/email and save the returning member list in a variable. Then you may generate a report (export to CSV) or do other things with it.
<#
The script accepts the name or email of an Exchange distribution list (GroupIdentity)
as a parameter and recursively retrieves all members, including those in any nested
distribution lists.
Script: Gather-DLMembers.ps1
Parameter: GroupIdenity (DL's name or email address)
Returns: Members list objects
Written by: Anand, the Awesome
#>
param ($GroupIdentity)
function Get-GroupMembersRecursive {
param (
[string]$GroupName
)
$members = Get-DistributionGroupMember -Identity $GroupName | `
Where-Object { $PSItem.RecipientType -ne 'User'}
foreach ($member in $members) {
if ($member.RecipientType -eq 'MailContact' `
-or $member.RecipientType -eq 'UserMailbox')
{
$MemberList.Add($member) | Out-Null
}
else
{
Get-GroupMembersRecursive -GroupName $member.Name
}
}
}
<#
* * * Script Starts Here * * *
#>
# Initialize an ArrayList to store member objects
$MemberList = [System.Collections.ArrayList]::new()
Get-GroupMembersRecursive -GroupName $GroupIdentity
return $MemberList
# * * * End of the Script * * *
Here is some examples:
This displays all members from the DL recursively:
c:\> Gather-DLMembers -GroupIdentity DL-Name
This will export the member list information (Name,Email) to a CSV file.
c:\> Gather-DLMembers -GroupIdentity DL-Name | Select DisplayName,PrimarySMTPAddress | Export-CSV -Path .\DL-Name-Members.csv
This will store the member list in a variable:
c:\> $Members = Gather-DLMembers -GroupIdentity DL-Name
Anand, the Architect 