there's a lot of config options and advanced stuff you can do with it. tends to be really good for hosting things too. susimail would be nice as standalone though, i think you can do it but not easy

iirc 25 is the max for priority for a queue system with messages. you can set it up for dev updates to try the newest stuff if you want (though sometimes things can break), i tend to increase the exploratory tunnels to 16. Also like to set http tunnel to reduce tunnel quantity on idle/close tunnel after ~10 mins, select new keys on reopen so i get fresh b32 for http proxy.

when you enable advanced though it gives explanations of what they do in the (?) button on that page