On Wed, Dec 29, 2010 at 10:47:11PM +1100, SJP Lists wrote:
| This raises the PTR problem.
| 
| Only one of those domains is going to have records that match forward
| and reverse?  If not, some anti-SPAM gateways will drop.

How so ?

a.example.com.  IN      MX      10      mx.example.com.
b.example.com.  IN      MX      10      mx.example.com.
c.example.com.  IN      MX      10      mx.example.com.
d.example.com.  IN      MX      10      mx.example.com.
mx.example.com. IN      A       192.0.2.1
mx.example.com. IN      AAAA    2001:db8::1
1.2.0.192.in-addr.arpa. IN      PTR     mx.example.com.
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.       
IN      PTR     mx.example.com.

Why does your MX have to live in the same zone as what it's MX'ing
for ?

Paul 'WEiRD' de Weerd

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