I've set up a new domain on my new server and when testing the DNS I receive 2 warnings that I'm concerned about:
Delivery over IPv4 to firstname.lastname@example.org could not be done.
Failed to deliver email for SOA RNAME of domain.co.uk (server.domain.co.uk) using email@example.com.
Does anybody have any thoughts on how I can resolve these errors. I have a SOA record in place as well as rDNS (as far as I can see in my DNS), but I can't work out why these errors are displayed. The email address is definitely set up and working too.