Robin Becker wrote:
Jeffrey Goldberg wrote:
The checking will work fine with virtual domains. What matters is that
DNS(rDNS(IP)) = IP = DNS(vhost)
I think I've got that right. (It's a bit more complicated to state
when MXes and multiple A records for the same name are considered, but
this is the general idea.)
This is your problem:
Ass long as the reverse DNS for the sending IP does not resolve to an
existing domain name you are fried. Fix that and you're all set.
dig -x 217.196.247.135
; <<>> DiG 9.3.3 <<>> -x 217.196.247.135
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28770
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;135.247.196.217.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
247.196.217.in-addr.arpa. 3600 IN SOA ns0.highspeedoffice.net.
hostmaster.highspeedoffice.net. 2007061800 28800 7200 2419200 3600
;; Query time: 56 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Oct 12 22:09:13 2007
;; MSG SIZE rcvd: 116
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