Amigo mais eu só estou com esse problema agora esta asim o problema esta tudo ok menos esse reverso.
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:
45.231.217.200.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0)]