FAIL All WWW IPs public Error: At least one of your WWW IPs is not a public IP. The problem IP(s) are:
WWW: FAILED
111.11.11.11 (the virtual ip, not my primary) is not a public IP
That means that some or all people trying to get to your web site will not be able to get there.
MX: FAILED
All MX IPs public Error: At least one of your MX records points to an IP address that is not a public IP. The problem IP(s) are:
111.11.111 (virtual ip) is not a public IP
Note that these IPs are not reachable, which can cause extra resource usage, slight mail delays, and possibly bounced mail.
MX: FAILED
Reverse DNS entries for MX records ERROR: The IP of one or more of your mail server(s) have no reverse DNS (PTR) entries (if you see "Timeout" below, it may mean that your DNS servers did not respond fast enough). RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff site. The problem MX records are:
162.220.16.172.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0)]
Mail: FAILED
Connect to mail servers ERROR: I could not complete a connection to any of your mailservers!
mydomain.com: Timed out [Last data sent: None]
If this is a timeout problem, note that the DNS report only waits about 30 seconds for responses, so your mail may work fine in this case but you will need to use testing tools specifically designed for such situations.