Thanks, but it's not that hard. If you want to try best option is to choose a good ISP that let you use port 25 and have PTR registry for your inverse-dns and a fixed IP as a good or free price. Then use one of those two server distros as they have everything ready built-in: https://www.freedombox.org/ https://yunohost.org/ BTW for learning greek duolingo is very good. Have fun!