DNS Report issues 4 warnings

Gday Experts,

I have run a DNS report on my domain (hcagroup.com.au) using the tools at dnsstuff.com, they have issued 4 warnings, I would like assistance in getting of the following.

WARN      
Glue at parent nameservers      
WARNING. The parent servers (I checked with ns3.ausregistry.net.au.) are not providing glue for all your nameservers. This means that they are supplying the NS records (host.example.com), but not supplying the A records (192.0.2.53), which can cause slightly slower connections, and may cause incompatibilities with some non-RFC-compliant programs. This is perfectly acceptable behavior per the RFCs. This will usually occur if your DNS servers are not in the same TLD as your domain (for example, a DNS server of "ns1.example.org" for the domain "example.com"). In this case, you can speed up the connections slightly by having NS records that are in the same TLD as your domain.


WARN      
Nameservers on separate class C's
WARNING: We cannot test to see if your nameservers are all on the same Class C (technically, /24) range, because the root servers are not sending glue. We plan to add such a test later, but today you will have to manually check to make sure that they are on separate Class C ranges. Your nameservers should be at geographically dispersed locations. You should not have all of your nameservers at the same location. RFC2182 3.1 goes into more detail about secondary nameserver location.


WARN      
Acceptance of postmaster address      
WARNING: One or more of your mailservers may not accept mail to postmaster@hcagroup.com.au (it is generating a temporary error). Mailservers are required (RFC822 6.3, RFC1123 5.2.7, and RFC2821 4.5.1) to accept mail to postmaster.

filter1.hcagro-1.mailguard.com.au's postmaster response:<br /> >>> RCPT TO:<postmaster@hcagroup.com.au><br /> <<< 459 4.7.1 <postmaster@hcagroup.com.au>: Recipient address rejected: Service is unavailable <br />




WARN      
Acceptance of abuse address      
WARNING: One or more of your mailservers does not accept mail to abuse@hcagroup.com.au. Mailservers are expected by RFC2142 to accept mail to abuse.

filter1.hcagro-1.mailguard.com.au's abuse response:<br /> >>> RCPT TO:<abuse@hcagroup.com.au><br /> <<< 459 4.7.1 <abuse@hcagroup.com.au>: Recipient address rejected: Service is unavailable <br />


Thank is advanced guys sincerely,
-- ZemondStart Free Trial