CyberPanel with working email and dns servers.

Hi, trying to build server, im working with VPS Ubuntu 20.04 (root)
Namecheap domain

Im trying to spin working stack with email and dns.

I addied private DNS servers ns1 and ns2 in name cheap and pointed it to my server IP

Installed CyberPanel and add website, then I tick
DKIM Support
Create Mail Domain

Do I need tick create mail domain, whats that for, it creates ?

After that I can see DNS records were addied automatically, is that it, should works?

Following guide