Allowing sales@, support@ or any user at the same domain to be able to send but not allow it to be set to any user from another domain on the same server.
I am unsure of what you are trying to do here. Can you explain the use case?
I believe the goal is to introduce a configuration option for Exim to restrict trusted mail users from spoofing another domain name on the server that the user may not control or own, but still preserve the authenticated sender's existing ability to send as another e-mail address at their own domain name.Example:
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