How to setup dmarc dkim and spf records?

SYSTEM INFORMATION
OS type and version centos 7 min
Virtualmin version virtualmin 7

how can i setup the dkim dmarc and spf records is there any howto?

thank you

nikos

A quick google provides this link for dkim:

https://www.virtualmin.com/documentation/email/dkim/

I’m sure there are other guides too.