You prefer the blind-fold solution: the Microsoft way where you click click and 
click again here and there and feel good that you have solved the problem. 
Unfortunately it does not work that way. We blacklisted Microsoft IPs without 
RDNS, out of evidence, while Zen has them whitelisted out of nowhere, for 
example.

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On Wed, May 30, 2018 at 06:06, Axb <axb.li...@gmail.com> wrote:

> On 05/30/2018 12:50 AM, Rupert Gallagher wrote: > We spent months herding 
> those free-range animals... Catching them is tedious, because there is no 
> standard that binds ISPs to just prefix all such domains with "dyn-". which 
> is why it's so efficient to use Spamhaus' PBL (included in Zen) 
> https://www.spamhaus.org/pbl/ and spend the gained time chasing waterfalls, 
> unicorns and world peace.

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