Have any guides to look into? I had read somewhere that the non-big providers are blocked. Something along those lines.
Discussion
I personally just use postfix for SMTP, dovecot for mailbox, and spamassassin/sieve for spam filtering. A lot of guides and documentation out there for these common services.
I then just choose a web front end for accessing my email. For myself, I actually close off all external/public access for email retrieval. So the only open port to my email is port 25 for sending email to me. Accessing the web front end can only be done on my local LAN or over a Tor onion service with a client key. That way I can ensure access to my emails is locked down.