==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.2.1
- Deployed with iRedMail Easy or the downloadable installer? Installer
- Linux/BSD distribution name and version: Debian 10
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MariaDB
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Nope
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello, today I discovered iRedMail for me and decided to play a bit around.
Sending and receiving e-mails on my own network works pretty fine.

Now I have to set up the DNS entries. According to https://docs.iredmail.org/setup.dns.html  it shouldn't be a problem.
But where do I have to set up those records?
etc/hosts and etc/hostname? Or do I need something like cloudflare.com?

Thanks in advance :-)