Here’s a diagram of Mail-in-a-Box’s architecture:
(latest at https://mailinabox.email/static/architecture.svg)
I hope this is helpful when looking into how to improve Mail-in-a-Box.
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Wow ! amazing work ! I started doing it myself, but there’s really lot of stuff to configure. Thanks for this great work ! 
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Wow this is amazing, having a diagram like this really helps in understanding the architecture.
PS: John, what tool did you use to generate this file? It’s simple but effective way of communicating.
Inkscape.
(Btw, the image here is out of date. See the one on the website.)