IMHO regex setups are even more reliable we do this with our postfix setup.

For example:
/^c-.+-.+-.+-.+\..+\..+\.comcast\.net$/ REJECT
dynamic ip address use isp for outgoing email - access.regex

I think is more reliable than just by name or especially by IP since IP
allocations do change.


Larry Ludwig
Empowering Media
1-866-792-0489 x600
Managed and Unmanaged Xen VPSes


From: Marc Perkel []
Sent: Friday, May 30, 2008 12:04 PM
Subject: Re: DNS ISP Host List Available

Matus UHLAR - fantomas wrote:

Marc Perkel wrote:

I've also created a DNS based list of domains that provide consumer

dynamic IP address space. I'm using this list internally but thought

I'd make it public in case others can use it.

Trying to inspire innovation.



This list was created by grabbing the registry barrier part of the

domain name of IPs from other DNS lists that list the IPs as dynamic.

Ken A wrote:

NJABL & PBL already provide this, AND they are already part of

SpamAssassin AND they work quite well.

So, while you are 'trying to inspire innovation', you should take note

of this potential problem:

On 29.05.08 14:49, Marc Perkel wrote:

They have name based lists? Show me where.

why should anyone need name-based lists?

Name based DNS lists are more reliable because IP addresses can change. The
name based list covers all IP addresses where the FCrDNS resolves to that