genuine bulk email

[Per olof Ljungmark]

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