@a_fancy_kiwi Exactly! In a business environment where you need to squeeze every possible penny and every second of downtime is money lost, OP is introducing additional potential points of failure.
In a homelab where downtime is just an inconvenience? Go for it! Try it for yourself and see how you like it!
@jennifilm Isn't Thunderbird open source? It worked well enough for the bit I used it ages ago.