I have set-up the RDNS from my hosting provider for the ip address to resolve to "maximus.example.com". After that, do I also need to add the PTR records to the SPF Text details in my DNS zone file as well like this?
v=spf1 include:_spf.google.com ip4:18.104.22.168 ptr:maximus.example.com ~all
My question: Is the above addition of PTR details to SPF record necessary or is it not needed when the host already set-up the RDNS for my ip address?
I was going to add the record to my SPF and I then read this somewhere that this is strongly discouraged.
Note: The ptr sender mechanism is strongly discouraged by RFC 7208 which even goes so far as to suggest its immediate removal for performance reasons since it places a load on the IN-ADDR.ARPA (IPv4) or IP6.ARPA reverse-map domains which generally have less capacity than the gTLD and ccTLD domains.
I am not sure if I have misunderstood what it meant. So can someone please clarify this for me please since I am unsure whether I need to add PTR to my zone file or not..