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I came across these tutorials

Haven't tried them yet but they look good

nginx;

https://www.upcloud.com/support/inst...encrypt-nginx/

postfix-email-setup;
https://www.upcloud.com/support/secu...-lets-encrypt/

https://www.digitalocean.com/communi...domain-droplet

https://sourceforge.net/projects/pos...ixadmin-3.0.2/

Setting up the mail server is 'advanced'

You need root on the server to do this