Hi
I have server with 2 IPs - both of which rDNS to mymaindomain.co.uk.
I run several domains on the first IP (including mymaindomain.co.uk) and all of these work fine.
On the second IP I run a few other domains but when I send email it is often getting classified as Spam. I did a test on DNSSTuff.com and it reports:
Code:
WARNING: The hostname in the SMTP greeting does not match the reverse DNS (PTR) record for your mail server. This probably won't cause any harm, but may be a technical violation of RFC5321
This test is fine on all the domains on the first IP but as above on all those on the second.
The Mail Server Test Center tool on DNSStuff.com also reports a DNS mismatch but when I do reverse lookup on both domains they both show the same as my SMTP server name. SPF records are fine on both IPs.
However, the checks at mxtoolbox.com all pass fine for both IPs.
After quite a bit of digging I found another test on DNSStuff for IP information, which amongst other things, listed Reverse-verified as Yes on the first IP but No on the second.
TBH I had never heard of it but from what I can gather, the problem is that the forward DNS only resolves to the first IP as this where I host it and there is nothing for this domain on the second IP.
So I *assume* (always dangerous I know, so that's why I am checking!) that I need to add a DNS record that also points to the second IP as well as the first? If so, how do I do that if all the services are on the first IP?
Sorry for the long ramble but DNS is NOT one of my strengths!
Server is Cent OS 6.4, with Plesk 11.5.30, using Postfix.
Thanks for any help