Securing your mail Domain

A quick addition to the DNS record of your domain to proof your ownership and validity of eMails:

       IN      TXT     "v=spf1 mx a -all"
_dmarc IN      TXT     "v=DMARC1\; p=reject\; pct=100\; rua=mailto:postmaster@example.com"

And best to add an DKIM record too.