Unauthorized mailbox access in Exchange Online allows individuals to read and access organization’s mailboxes, resulting in sensitive data leakage. Also, managing all those mailboxes has always been a challenging task for admins. This guide explores effective methods to detect mailbox permission changes to prevent security breaches in Microsoft 365.
Add-MailboxPermission, Get-MailboxPermission, Remove-MailboxPermission,Set-Mailbox, Add-RecipientPermission, Remove-RecipientPermission, Get-RecipientPermission
Windows PowerShell Connect-Exchangeonline Windows PowerShell Search-UnifiedAuditLog -StartDate YYYY-MM-DDTHH:MM:SS -EndDate YYYY-MM-DDTHH:MM:SS -RecordType "ExchangeAdmin" -Operations "Add-MailboxPermission", "Get -MailboxPermission", "Remove -MailboxPermission", "Set -Mailbox", "Add -RecipientPermission", "Remove -RecipientPermission", "Get -RecipientPermission" | Format-Table 
Get the list of mailbox permission changes with properties like event time, authorized by, authorized via, operation, client IP, etc.
AdminDroid Exchange Online auditing reports provide thorough insights into mailbox permission changes, enabling admins to monitor and manage access rights effectively. With AdminDroid, you can easily track mailbox permissions, detect unauthorized access, and ensure compliance with security policies.
Gain visibility into mailbox access activities, and stay updated on every aspect of mailbox interactions to prevent email vulnerabilities within the organization.
Utilize AdminDroid’s mailbox usage reports, and manage the mailbox storage efficiently before running out of space.
Empower admins with email forwarding reports to check the status of mail forwarding and ensure secure mail flow in your organization.
Retrieve a mailbox analytics dashboard to gain insights into mailboxes and their permissions accumulated in a single place.
Uphold email security by getting detailed insights on spam, malware, and phishing emails, including threat protection details using mail protection reports.
Learn the various methods for generating comprehensive non-owner mailbox access report to track delegation activities and prevent email data leakage.
Overall, AdminDroid’s Exchange Online management tool provides valuable assistance in managing mailbox delegate permissions assigned to users, admins, and guests, and streamline the process of mailbox permission management.
The script encounters this error due to the current execution policy being set to restricted by default, that prevents script execution.
Set-ExecutionPolicy -ExecutionPolicy RemoteSignedThis occurs when auditing has not been enabled for the specific mailbox.
Set-Mailbox <Display Name> -AuditEnabled $trueThis issue occurs when you try to run the Exchange Online PowerShell cmdlets with insufficient permissions.
This issue occurs when the end date is earlier than the start date.
This error occurs when you try to run the code without connecting to Exchange online.
Connect-ExchangeOnlineMicrosoft 365 Purview has a tenant-wide audit logging configuration that automatically activates mailbox auditing for all Microsoft 365 mailboxes, group mailboxes, and shared mailboxes. This ensures that actions by admins, delegates, and owners are automatically audited for better security.
To check the status of the mailbox auditing, run the below cmdlet in Exchange Online PowerShell.
Get-OrganizationConfig | Select AuditDisabledIf it is true, then it means mailbox auditing is disabled for your organization. To enable mailbox auditing, you can use the below cmdlet.
Set-OrganizationConfig -AuditDisabled $FalseThus, mailbox auditing provides visibility into email activities that help to detect and respond to security incidents in your organization.
Utilize AdminDroid's mailbox audit configurations reports that provides detailed insights on Exchange Online mailbox audit details.
Changing mailbox permissions in Exchange Online can lead to various risks, such as,
To mitigate these risks, organizations should establish concise guidelines for managing mailbox permissions, conduct regular compliance checks, and provide effective training to employees.
You can use the below cmdlet to check and find any unauthorized mailbox permission changes in Exchange Online.
Use the Search-UnifiedAuditLog cmdlet to get the mailbox permission changes activities.
Search-UnifiedAuditLog -StartDate YYYY-MM-DDTHH:MM:SS -EndDate YYYY-MM-DDTHH:MM:SS -RecordType "ExchangeAdmin"Admins can easily track changes in Exchange mailbox permissions using PowerShell. However, filtering out changes related to Send On Behalf permissions is difficult since it occurs in different property.
Thus, with the help of the provided AuditMailboxPermissionChanges PowerShell script, you can generate multiple reports to manage mailbox permission changes in your Microsoft 365 organization.
Also, this script supports built-in filters. So, you can combine multiple filters to get more granular reports.
Each of these use cases provides different insights into mailbox permission changes, making it easier to manage mailboxes in your organization.
Various levels of access permissions can be assigned to users in Exchange Online to facilitate collaboration and ensure efficient management of mailbox activities.
These distinct levels of delegation allow organizations to customize who can access mailboxes based on their needs.
AdminDroid provides dedicated reports to find User’s Send As Activities and User’s Send On Behalf Activities, which helps in the monitoring of the delegated user’s mailbox activities.
Shared mailboxes are commonly used in organizations to allow multiple users to access and manage emails sent from a specific address. Understanding who has access to a shared mailbox and what level of permissions they possess is crucial for preventing data breaches and loss of accountability. Follow the below steps to find the permissions of Exchange Online shared mailbox.
Take a look at AdminDroid guide on how to export Microsoft 365 shared mailbox permissions report to obtain comprehensive details on shared mailbox delegation and its properties efficiently.
Here is a quick overview,
Microsoft 365 admins often need to adjust mailbox permissions to accommodate changes in roles, responsibilities, or workforce arrangements. Understanding how to change mailbox permissions helps admins to grant or revoke access, delegate management tasks, and enforce security policies effectively. Follow the below steps to change mailbox permissions via Exchange Online.
Managing delegate permissions across multiple Exchange Online mailboxes is crucial to prevent security breaches, compliance violations, and data leakage.
AdminDroid simplifies mailbox management process by offering a comprehensive guide to check Exchange Online mailbox permission reports, so that you can find every mailbox’s permissions in Exchange Online within Microsoft 365.
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