Block sign-in for shared mailbox accounts in Office 365, in this article we will check how to configure Block sign-in for shared mailbox accounts in Office 365.
Shared mailbox accounts play a vital role in organizations, enabling multiple users to access and manage a common mailbox. However, there may be instances where you need to restrict sign-in access to these shared mailboxes for security or privacy purposes. In this article, we will explore two methods to restrict sign-in for shared mailbox accounts using both GUI (Graphical User Interface) and PowerShell.

Table of Contents
Block sign-in for shared mailbox accounts in Office 365
Method 1: Restricting Sign-In for Shared Mailbox Accounts using GUI
Step 1: Access Exchange Admin Center (EAC)
Begin by opening a web browser and navigating to your Exchange Admin Center (EAC). Sign in using your administrative credentials.
Step 2: Navigate to Recipients
Once logged in, locate and click on the “Recipients” tab situated on the left-hand side of the EAC.
Step 3: Select the Shared Mailbox Account
Choose the shared mailbox account that you wish to restrict sign-in access from the list of recipients displayed in the EAC.
Step 4: Disable Sign-In
Within the shared mailbox details, click on “Mailbox Features” and find the “ActiveSync” feature. Disable this feature to prevent sign-in access to the shared mailbox account.
Step 5: Save Changes
After disabling the ActiveSync feature, click on the “Save” button to apply the changes. Sign-in access to the shared mailbox account will now be restricted.
Method 2: Restricting Sign-In for Shared Mailbox Accounts using PowerShell
Step 1: Open PowerShell
Launch PowerShell with administrative privileges.
Step 2: Connect to Exchange Online
Establish a connection to Exchange Online by running the following command:
Connect-ExchangeOnline
Step 3: Restrict Sign-In Access
To restrict sign-in access for a shared mailbox account, utilize the following command:
Set-CASMailbox -Identity <SharedMailboxIdentity> -ActiveSyncEnabled $false
Replace <SharedMailboxIdentity>
with the identity or email address of the shared mailbox account you want to block sign-in for.
Step 4: Verify the Changes
To ensure that sign-in access has been successfully restricted, execute the following command to retrieve the mailbox features:
Get-CASMailbox -Identity <SharedMailboxIdentity> | Select-Object ActiveSyncEnabled
Again, substitute <SharedMailboxIdentity>
with the appropriate shared mailbox identity.
Conclusion
Restricting sign-in access for shared mailbox accounts is crucial to maintaining security and privacy within an organization. By following the methods outlined in this article, you can easily restrict sign-in access using both the Graphical User Interface (GUI) and PowerShell. Whether you prefer the convenience of a GUI or the power and efficiency of PowerShell, these steps will help you secure your shared mailbox accounts effectively. Remember to regularly review and manage access rights to shared mailboxes to maintain a robust security posture within your organization.
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