Is there a way to apply a whitelist of email addresses within a domain that would allow email originating from the whitelisted names and stop all others? For example, the whitelist includes email@example.com, firstname.lastname@example.org, & email@example.com. An email populates the remote delivery folder with ABC@otherdomain.com and since it's not on the whitelist, it's not sent.
I know this sounds like I have a relay issue and that's not where I'm going with this. Just a question if this can be done or not. Thanks.