[Coco] yahoo groups

[Kevin Diggs]

John E. Malmberg wrote:
> 
> Not possible.  rDNS can not be forged unless the DNS server belonging to 
> the network owner has been hacked.  An ISP can only set rDNS for servers 
> in its own I.P. range, it can not set it for anyone else's.  The system 
> works differently than for domain name lookups.
> 
> Because rDNS can not be forged, many mail server operators use the 
> values from it to for spam filtering.  If they get spam from a subnet of 
> 132.453.xxxx.example.com, they are likely to set a rule to refuse all 
> e-mail originating from xxxx.example.com.
> 
> The rDNS is your actual pubic server name.  It does not have to match 
> the domain name that you purchased.  But that domain name and hostname 
> combination is actually an alias for the true name.
> 
> It can be important to have the rDNS name contain your purchased domain 
> name if you are running a mail server to prevent problems if one of the 
> other users of your ISP gets zombied, and your ISP does not act on spam 
> complaints in real-time.
> 
> It is also important to make sure that the postmaster and abuse 
> addresses for the domains indicated by rDNS are working and actually 
> read, because that is where reports about problems are most likely to be 
> sent.
> 
> -John
> wb8tyw(at)qsl.network
> Personal Opinion Only
> 
rDNS? What is rDNS? Is it like a reverse DNS name resolution? Is there a 
*nix utility to find it?

kevin