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OWA: add from address using PowerShell
Staff have access to many shared mailboxes and SendAs permission to be able to send from those shared mailboxes. To simplify things for them, I have set: Set-MailboxMessageConfiguration-Al...
There's no way to do this unfortunately. The "from" list in OWA is kept in the mailbox and is different than the one used in Outlook, but there are no tools to modify it that I am aware of.