How to set up a domain in centOS7?

Question

CentOS

Tell me how to set up \etc\hosts, do I need to write down my domain in it?
Now it looks like this!
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
127.0.0.1 kjfyikn kjfyikn

Answer 1

You need to configure:
- DKIM
- SPF
- DMARC
This is necessary to officially confirm that you are sending emails from a real domain, from a real server to which this domain belongs. These settings will have to be entered in the DNS records of your DNS provider. To configure DKIM, you will need to configure the outgoing mail server itself, everything is configured elementarily, and there are a lot of guides on the network on how to do this.
Then check (and check more often) your DNS records with, for example: https://mxtoolbox.com/