I'd like to take my existing SMTP server that is within my network, and limit where it can send emails. I only want emails to go out to addresses that are within my domain.
Currently, anyone with access to the server can send to any email in the world. Moving forward I only want emails to go to firstname.lastname@example.org. All other emails should be ignored.
I'm currently using Windows server 2012 with Microsoft's SMTP module.
Is there a way to set this up with my current solution or is there another product that will cover this?
All help is appreciated.