[rbldnsd] domain-based (black|white)listing - possible?

[Szymon Grabowski]

On Sat, 26 Mar 2005 21:59:57 -0800, Jeff Chan <jeffc at surbl.org> wrote:
> [snip]
> Sounds like you need your MTA to be able to block sending server
> domain names.  Sounds more like an MTA question than a rbldnsd
> question.

I had (incorrectly) assumed that rbldnsd would
reverse the IP address to match against the
dnset entries.

> That said, blocking senders by name many not be very useful since
> the names can be forged, inconsistent, not map to spammer
> domains, etc.  For this application IPs may be better.

IP blocking/whitelisting will always remain the
main mechanism for us, while domain-based
blocking/whitelisting could provide secondary
support.

In the world of automatic blocks that use
hundreds of different rules and policies it
is at times nice to be able to say "never ban
an IP address that has rDNS ending with
mx.aol.com" (as per AOL's SPF record).

= Simon