> At 12:36 21-08-2007, John Rudd wrote: > ># nslookup www2mail.wordreference.com > > > >Non-authoritative answer: > >Name: www2mail.wordreference.com > >Address: 75.126.29.11 > > > >baddns. > > There's an authoritative answer for www2mail.wordreference.com. > > ># nslookup server.nch.com.au > > > >Non-authoritative answer: > >Name: server.nch.com.au > >Address: 69.94.122.247 > > And one for server.nch.com.au as well.
The point isn't authoritative or not. The point is that the email was sent (in the last case) from 69.94.122.246, which resolves back to server.nch.com.au, which resolves to 69.94.122.247, a DIFFERENT IP address. The sending IP need RDNS and that RDNS name needs to resolve back to the same IP, otherwise, it's broken. Bret
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