No need for a bunch of hoopla, here’s the short and sweet version.
Add Send As Permission for All Users from a User Account
Get-Mailbox -ResultSize Unlimited | Add-ADPermission -User "YourDomain\Username" -Extendedrights "Send As"
To add send as permissions for future users, we need to create a powershell script with the above line in it, make sure you have enabled the use of unsigned scripts by issuing the “Set-ExecutionPolicy remotesigned” command at an administrator ran PowerShell prompt, and create a task scheduler job to run our script with the administrator credentials saved in there.
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