I created website for someone, but also someone (I guess some SEO guy) told this person that I made big mistake because there are missing DNS records on domain (mx, SPF, dmarc). Now I need to "fix" my error.
Thing is, of course these records are used for Email purposes, but there is NO email in this domain (just simple free Gmail account).
So, is there any reason to add these records anyway? How they should look like? Only reason I can think of is preventing SPAM using my domain identity. But I thought that SPAM filters are not going to pass email from my domain anyway if these records are missing, so what's the point?