mirror of
https://github.com/admindroid-community/powershell-scripts.git
synced 2025-12-17 16:35:19 +00:00
127 lines
5.1 KiB
PowerShell
127 lines
5.1 KiB
PowerShell
<#
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=============================================================================================
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Name: Get Distribution Lists with External Users in Microsoft 365
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Version: 1.0
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Website: o365reports.com
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Script Highlights:
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~~~~~~~~~~~~~~~~~
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1. Generates a list of distribution groups with external users in Microsoft 365.
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2. Excludes external mail contacts by default, with an option to include them if required.
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3. The script automatically verifies and installs the Exchange PowerShell module (if not installed already) upon your confirmation.
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4. Exports report results to CSV.
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5. The script supports Certificate-based authentication (CBA).
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6. The script is schedular friendly.
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For detailed Script execution: https://o365reports.com/2024/12/17/get-distribution-lists-with-external-users-in-microsoft-365/
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============================================================================================
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#>Param
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(
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[Parameter(Mandatory = $false)]
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[string]$UserName=$Null,
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[string]$Password=$Null,
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[string]$Organization,
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[string]$ClientId,
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[string]$CertificateThumbprint,
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[switch]$IncludeContacts
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)
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Function Connect_Exo
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{
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#Check for EXO module inatallation
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$Module = Get-Module ExchangeOnlineManagement -ListAvailable
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if($Module.count -eq 0)
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{
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Write-Host Exchange Online PowerShell module is not available -ForegroundColor yellow
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$Confirm= Read-Host Are you sure you want to install module? [Y] Yes [N] No
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if($Confirm -match "[yY]")
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{
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Write-host "Installing Exchange Online PowerShell module"
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Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force
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}
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else
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{
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Write-Host EXO module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet.
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Exit
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}
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}
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Write-Host Connecting to Exchange Online...
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#Storing credential in script for scheduling purpose/ Passing credential as parameter - Authentication using non-MFA account
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if(($UserName -ne "") -and ($Password -ne ""))
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{
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$SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
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$Credential = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
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Connect-ExchangeOnline -Credential $Credential -ShowBanner:$false
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}
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elseif($Organization -ne "" -and $ClientId -ne "" -and $CertificateThumbprint -ne "")
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{
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Connect-ExchangeOnline -AppId $ClientId -CertificateThumbprint $CertificateThumbprint -Organization $Organization -ShowBanner:$false
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}
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else
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{
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Connect-ExchangeOnline -ShowBanner:$false
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}
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}
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Connect_Exo
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$Location=Get-Location
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$OutputCsv="$Location\DLs_with_ExternalUsers_Report_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv"
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$DLWithExternalUsersCount=0
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$DLCount=0
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#Processing all DLs
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Get-DistributionGroup -ResultSize Unlimited | ForEach{
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$DLCount++
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Write-Progress -Activity "Finding Distribution List with ExternalUsers:" -Status "Processed DL Count: $DLCount" -CurrentOperation "Currently Processing DL Name: $_ "
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$DLName =$_.Name
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$DLEmailAddress=$_.PrimarySMTPAddress
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If($IncludeContacts.IsPresent)
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{
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$ExternalUsers=(Get-DistributionGroupMember $_.Name |where{$_.RecipientType -eq "MailContact" -or $_.RecipientType -eq "MailUser" })
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}
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Else
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{
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$ExternalUsers=(Get-DistributionGroupMember $_.Name |where{ $_.RecipientType -eq "MailUser" })
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}
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#Processing DLs with external users
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$ExternalUsersCount= ($ExternalUsers | Measure-Object).count
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If($ExternalUsersCount -ne '0')
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{
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$EmailAddress=$ExternalUsers.ExternalEmailAddress | foreach {
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$_.split(":")[1]}
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$EmailAddress= $EmailAddress -join (",")
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$ExternalUserName=$ExternalUsers.Name -join ','
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$ExternalUserDisplayName=$ExternalUsers.DisplayName -join ','
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$Result=New-Object PsObject -Property @{'DL Name'=$DLName;'DL Email Address'=$DLEmailAddress;'No of External Users in DL'=$ExternalUsersCount;'External Users Name'=$ExternalUserName;'External Users Display Name'=$ExternalUserDisplayName;'Exterenal Users Email Address'=$EmailAddress}
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$Result|Select-Object 'DL Name','DL Email Address','No of External Users in DL','External Users Name','External Users Display Name','Exterenal Users Email Address'|Export-CSV -Path $OutputCsv -NoTypeInformation -Append
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$DLWithExternalUsersCount++
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}
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}
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#Disconnect Exchange Online session
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Disconnect-ExchangeOnline -Confirm:$false
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Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
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Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green `n
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if((Test-Path -Path $OutputCsv) -eq "True")
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{
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Write-Host $DLWithExternalUsersCount DLs contain external user as members.
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Write-Host `nDetailed report available in: -NoNewline -Foregroundcolor Yellow; Write-Host $OutputCSV
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$Prompt = New-Object -ComObject wscript.shell
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$UserInput = $Prompt.popup("Do you want to open output file?",`
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0,"Open Output File",4)
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If ($UserInput -eq 6)
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{
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Invoke-Item "$OutputCSV"
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}
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}
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else
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{
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Write-Host No DLs found with the specific criteria.
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} |