Today, I'd like to share how to revoke recipient permission from shared mailbox in office 365. Powershell Syntax for this taks is as below, Revoke Full Access permissions for Shared Mailbox Remove-MailboxPermission < Shared Mailbox Name or Full e-mail address> -User -AccessRights FullAccess Revoke Send As permissions for Shared Mailbox Remove-RecipientPermission -AccessRights SendAs -Trustee For example, I want to revoke the Full & Send As permission from helpdesk@ictformyanmar.com that given from technical-support@ictformyanmar.com before. Before revoke those permissions, I'll check effected permission on technical-support@ictformyanmar.com to ensure. Use below powershell command to check the effected permission,