People ask questions like this a lot and I don’t know what “is it possible” means.
Does Mail-in-a-Box do it now? No.
What would it take to make your Mail-in-a-Box do it? I don’t give general system administration advice and discourage discussion of that sort of thing here. You could ask on Server Fault or a forum for maintaining servers.
How hard would it be to add it to Mail-in-a-Box for everyone? I don’t know. This question can take hours to research to get a real answer. But basically every change is hard and results in years of bug fixes.
Is it something I plan to work on? No.
Would I merge a pull request to make Mail-in-a-Box do it? Possibly, depending on how disruptive the changes are to the existing setup, which of course I don’t know until I see it.