I have a user with username 'Self' - full name i.e. 'Self, Adam' I have a Hybrid set up. For some reason, when I migrate a mailbox to the cloud, this user is given Send As permission to the mailbox. This occurs also when i create a new mailbox in the Cloud. Knowing there is an attribute called Self in ea mailbox, I renamed the username to 'Self1' After a dirsync, I can not remove the 'Self, Adam' user from the Send As permission. The error says, 'the ACE isn't present. How can I remove this user?