SaorTech-cloud-services VS docker-mailserver

So you'll need a IMAP and SMTP service (one monitors incoming mail the other sends mail). The most common (and best) is postfix and dovecot. Then you'll need to add openDKIM so that your mail doesn't get sent to the Gulag when a receiver is using gmail or Yahoo. You'll also want to install SpamAssasin to filter spam mail and maybe a database although I don't think this is really necessary. If you really want to set it up from scratch I have an automation script I created a while ago below (or just use a guide there's loads out there). But honestly I think the best thing for you to do is to use something like Mailcow which uses docker containers of all these services and sets it up automatically. Takes a lot of the stress out of it and TRUST ME setting up an email server is the most tedious thing I've ever done and it still shits the bed on a Monthly bases. My automation script is here https://github.com/CoogyEoin/SaorTech-cloud-services/blob/main/services/install_mail_server_with_ssl.sh

I have used Roundcube docker-compose-fpm.yaml, which looks like it can be easily extended with docker-mailserver

However... For a live fire, in production setup I would push people to use a meta package like docker-mailserver, mailcow, mail-in-a-box or modoboa as it's better to have someone else set the sane defaults to prevent you from missing that one line in you config.

Se proprio vuoi farlo per il gusto di riprendere familiarità con i vari concetti, giocherei con dei set di container docker tipo https://github.com/tomav/docker-mailserver (su GitHub ne trovi molti altri, alcuni tipo mailcow anche con GUI per gestire il grosso delle opzioni).

Yes, spam learning is documented on the Wiki.