Re: And so it begins...

[David Gibbs <david@xxxxxxxxxxxx>]

Chris Bipes wrote:
> 1. We have several domains here at CrossCheck.  One mail server is hosting
> all the domains e-mail using one IP address.  How can rDNS resolve to all
> the domains to the same IP address.  Does rDNS give you a list of all the
> associated domains?

rDNS, by definition, can only resolve to a single host name.  One IP ==
one host name.

Multiple host names, of course, can resolve to the same IP.

> 2. We provided a service for retailers and acknowledge receipt of payment
> from the retailer to the consumer.  So in effect we are SPAMming for a real
> business reason.  This will never match the rDNS to the server's domains.
> rDNS just does not cut the mustard alone.  It should add points to a total
> score of SPAM filtering but not be a show stopper.

rDNS only means the IP owner is willing to point the address to a
specific name.  It's a weak anti-spam technique at best.  Useless at
worst.  I tried implementing a similar rule on my mail server (block
mail from server's who's IP doesn't resolve to a name) and ended up
rejecting a lot of legitimate mail.

david

-- 
David Gibbs
david@xxxxxxxxxxxx

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