[ionised]

Ars Technica had decent little guides for setting up secure web server and mail server;

Secure Web Server series;

https://arstechnica.com/series/web-served/

Mail Server Series

https://arstechnica.com/information-technology/2014/02/how-t...

https://arstechnica.com/information-technology/2014/03/takin...

https://arstechnica.com/business/2014/03/taking-e-mail-back-...

https://arstechnica.com/information-technology/2014/04/takin...