You Do Not Have The Permission To Send The Message On Behalf Of The Specified User Office 365, Before I add the O365 account, I can send emails just fine. This message could not be sent. You will need to get your admin to set it up - typically, and understandably, they will be reluctant to In this configuration, Exchange Server requires Send As permissions to send the email message. "This message could not be sent. When I try to send an email, I get this error: "You do not have the permission to If you've already configured the permissions but the user is still unable to use send as/ send on behalf via Outlook, this may be due to outdated You do not have the permission to send the message on behalf of the specified user. For every shared mailbox, we create a specific security group that contains 2 I get the following deliverable message when trying to send using another accounts email address: You can't send a message on behalf of this user unless you have permission to do so. If you don't have Send As permissions for the shared mailbox, Outlook can't send the message. , Cannot submit message. If you only need to give Send On Are you sure you have necessary permissions to send email from the specified address. Step 1: Go to Admin Center -> Select Exchange Admin Center.
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