Eli wrote: >> Maybe I'm missing something. Can I take one of my IP addresses and make >> the RDNS appear to be from xxx.amd.com and make a lookup on xxx.amd.com >> agree? > > Yes you can. That's why reverse DNS information is pretty much completely > useless when doing any type of tracing. I suggest you read up on DNS > servers and how zonefiles work et al before going too far on speculations > regarding DNS, especially if you're using the results to filter stuff (email > in this case). >
I think that if an host HELOes mail.domain.tld, rDNS is mail.domain.tld and A record for mail.domain.tld gives the good IP and rDNS is not a generic one, then you can probably trust the DNS info. But that still does not mean that the host only sends ham.
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