Public/Exchange/Mailbox/Get/Get-ExMailboxPermission.ps1
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<#
.SYNOPSIS Gets all permissions on an Exchange Online mailbox (Full Access, Send As, Send on Behalf) .DESCRIPTION This function retrieves and displays all permissions granted on a specific mailbox: - Full Access: Full access permissions to the mailbox - Send As: Permissions to send emails as the mailbox - Send on Behalf: Permissions to send emails on behalf of the mailbox .PARAMETER Identity The identity of the mailbox (email address, username, or display name) .PARAMETER ByDomain Filter mailboxes by domain name .PARAMETER UserPermission Find all permissions that a specific user has across all mailboxes (reverse lookup) .PARAMETER ExportToExcel Export the mailbox permissions to an Excel file .EXAMPLE Get-ExMailboxPermission -Identity "john.doe@contoso.com" Gets all permissions for the mailbox john.doe@contoso.com .EXAMPLE Get-ExMailboxPermission -Identity "john.doe@contoso.com" -ExportToExcel Gets all permissions for the mailbox and exports them to an Excel file .EXAMPLE Get-ExMailboxPermission -ByDomain "contoso.com" Gets all permissions for all mailboxes in the contoso.com domain .EXAMPLE Get-ExMailboxPermission -UserPermission "john.doe@contoso.com" Finds all mailbox permissions that john.doe@contoso.com has across all mailboxes .LINK https://ps365.clidsys.com/docs/commands/Get-ExMailboxPermission .NOTES Requires the ExchangeOnlineManagement module and an active connection to Exchange Online For Excel export functionality, requires the ImportExcel module #> function Get-ExMailboxPermission { param ( [Parameter(Mandatory = $false, Position = 0)] [string]$Identity, [Parameter(Mandatory = $false)] [string]$ByDomain, [Parameter(Mandatory = $false)] [string]$UserPermission, [Parameter(Mandatory = $false)] [switch]$ExportToExcel ) [System.Collections.Generic.List[PSCustomObject]] $allPermissions = @() # Determine which mailboxes to process if ($UserPermission) { Write-Host "Finding all permissions for user: $UserPermission" -ForegroundColor Green # Get all mailboxes to check permissions against $mailboxes = Get-EXOMailbox -ResultSize Unlimited -Properties WhenCreated, WhenChanged Write-Host "Checking permissions across $($mailboxes.Count) mailbox(es)" -ForegroundColor Yellow # Set flag for reverse lookup mode $isUserPermissionLookup = $true } elseif ($ByDomain) { Write-Host "Retrieving permissions for all mailboxes in domain: $ByDomain" -ForegroundColor Green $mailboxes = Get-EXOMailbox -ResultSize Unlimited -Filter "EmailAddresses -like '*@$ByDomain'" -Properties WhenCreated, WhenChanged | Where-Object { $_.PrimarySmtpAddress -like "*@$ByDomain" } Write-Host "Found $($mailboxes.Count) mailbox(es) in domain $ByDomain" -ForegroundColor Yellow $isUserPermissionLookup = $false } elseif ($Identity) { Write-Host "Retrieving permissions for mailbox: $Identity" -ForegroundColor Green try { $mailboxes = @(Get-EXOMailbox -Identity $Identity -ErrorAction Stop -Properties WhenCreated, WhenChanged) Write-Host "Mailbox found: $($mailboxes[0].DisplayName) ($($mailboxes[0].PrimarySmtpAddress))" -ForegroundColor Yellow } catch { Write-Error "Error retrieving mailbox '$Identity': $($_.Exception.Message)" return $null } $isUserPermissionLookup = $false } else { Write-Host 'Retrieving permissions for all mailboxes' -ForegroundColor Green $mailboxes = Get-EXOMailbox -ResultSize Unlimited -Properties WhenCreated, WhenChanged Write-Host "Found $($mailboxes.Count) mailbox(es)" -ForegroundColor Yellow $isUserPermissionLookup = $false } $totalMailboxes = $mailboxes.Count $currentMailbox = 0 foreach ($mailbox in $mailboxes) { $currentMailbox++ Write-Host "Processing mailbox $currentMailbox/$totalMailboxes : $($mailbox.DisplayName)" -ForegroundColor Cyan try { # 1. Get Full Access permissions $fullAccessPerms = @(Get-EXOMailboxPermission -Identity $mailbox.PrimarySmtpAddress -Properties WhenCreated, WhenChanged | Where-Object { $_.AccessRights -contains 'FullAccess' -and $_.User -notlike 'NT AUTHORITY\*' -and $_.User -notlike 'S-1-*' -and $_.Deny -eq $false }) foreach ($perm in $fullAccessPerms) { # If UserPermission mode, only add permissions for the specified user if ($isUserPermissionLookup -and $perm.User -ne $UserPermission) { continue } $allPermissions.Add([PSCustomObject]@{ MailboxIdentity = $mailbox.PrimarySmtpAddress MailboxDisplayName = $mailbox.DisplayName MailboxEmail = $mailbox.PrimarySmtpAddress PermissionType = 'Full Access' User = $perm.User AccessRights = ($perm.AccessRights -join ', ') InheritanceType = $perm.InheritanceType IsInherited = $perm.IsInherited MailboxWhenCreated = $mailbox.WhenCreated MailboxWhenModified = $mailbox.WhenChanged }) } # 2. Get Send As permissions $sendAsPerms = @(Get-EXORecipientPermission -Identity $mailbox.PrimarySmtpAddress | Where-Object { $_.AccessRights -contains 'SendAs' -and $_.Trustee -notlike 'NT AUTHORITY\*' -and $_.Trustee -notlike 'S-1-*' }) foreach ($perm in $sendAsPerms) { # If UserPermission mode, only add permissions for the specified user if ($isUserPermissionLookup -and $perm.Trustee -ne $UserPermission) { continue } $allPermissions.Add([PSCustomObject]@{ MailboxIdentity = $mailbox.PrimarySmtpAddress MailboxDisplayName = $mailbox.DisplayName MailboxEmail = $mailbox.PrimarySmtpAddress PermissionType = 'Send As' User = $perm.Trustee AccessRights = ($perm.AccessRights -join ', ') InheritanceType = $perm.InheritanceType IsInherited = $perm.IsInherited MailboxWhenCreated = $mailbox.WhenCreated MailboxWhenModified = $mailbox.WhenChanged }) } # 3. Get Send on Behalf permissions $sendOnBehalfUsers = @($mailbox.GrantSendOnBehalfTo) if ($sendOnBehalfUsers -and $sendOnBehalfUsers.Count -gt 0) { foreach ($user in $sendOnBehalfUsers) { # If UserPermission mode, only add permissions for the specified user if ($isUserPermissionLookup -and $user -ne $UserPermission) { continue } $allPermissions.Add([PSCustomObject]@{ MailboxIdentity = $mailbox.PrimarySmtpAddress MailboxDisplayName = $mailbox.DisplayName MailboxEmail = $mailbox.PrimarySmtpAddress PermissionType = 'Send on Behalf' User = $user AccessRights = 'SendOnBehalf' InheritanceType = 'None' IsInherited = $false MailboxWhenCreated = $mailbox.WhenCreated MailboxWhenModified = $mailbox.WhenChanged }) } } } catch { Write-Warning "Error processing mailbox $($mailbox.PrimarySmtpAddress): $($_.Exception.Message)" } } # Display results or export to Excel if ($allPermissions.Count -gt 0) { if ($ExportToExcel.IsPresent) { $now = Get-Date -Format 'yyyy-MM-dd_HHmmss' $filenameSuffix = if ($UserPermission) { "User-$($UserPermission -replace '[<>:"/\\|?*]', '_')" } elseif ($ByDomain) { "Domain-$($ByDomain -replace '[<>:"/\\|?*]', '_')" } elseif ($Identity) { $Identity -replace '[<>:"/\\|?*]', '_' } else { 'AllMailboxes' } $excelFilePath = "$($env:userprofile)\$now-ExMailboxPermissions-$filenameSuffix.xlsx" Write-Host -ForegroundColor Cyan "Exporting mailbox permissions to Excel file: $excelFilePath" $allPermissions | Export-Excel -Path $excelFilePath -AutoSize -AutoFilter -WorksheetName 'ExchangeMailboxPermissions' Write-Host -ForegroundColor Green 'Export completed successfully!' } else { Write-Host "`n=== PERMISSIONS SUMMARY ===" -ForegroundColor Yellow Write-Host "Total permissions found: $($allPermissions.Count)" -ForegroundColor Yellow # Group by permission type $groupedPerms = $allPermissions | Group-Object PermissionType foreach ($group in $groupedPerms) { Write-Host "`n--- $($group.Name) ---" -ForegroundColor Cyan $group.Group | Format-Table User, AccessRights, IsInherited -AutoSize } return $allPermissions } } else { Write-Host "`nNo permissions found." -ForegroundColor Yellow return $null } } |