For a small business, a service such as GoogleApps or Microsoft365 is likely going to be a cheaper solution than self hosting this. Plus including productivity applications and cloud storage as part of the package in most instances.
It will be much, much safer as well. If you’re unsure of how to do this, do not do it yourself. Setup a home lab, sure. Use it to learn but do not run your business this way!
Source: Am e-mail admin.
Especially in tight carparks, it’s much easier to get both in and out with a large vehicle. Plus you can see much better which on a car with no reverse camera is a big plus.