DoH plugin for BIND

Paul Kosinski bind at
Sat May 2 13:30:32 UTC 2020

How many ISPs allow traffic on port 25? My impression is that even many
(non-enterprise) business customers can't use port 25.

On Sat, 2 May 2020 09:28:54 +0200
Reindl Harald <h.reindl at> wrote:

> Am 02.05.20 um 09:00 schrieb Michael De Roover:
> > That's actually my biggest concern with DoH, ISP blocking. It doesn't
> > seem as obvious as it is with DoT, but deep packet inspection (DPI) is
> > already a thing. Don't expect an ISP that wants to block DoT to not
> > (want to) block DoH either. The crux of the problem at that point is not
> > the technology, it is the ISP's incentives. If the ISP wants to block
> > DoT for whatever reason, personally I'd consider it.. not exactly fine
> > but at least their right to do so. That's their decision to make.   
> seriously?
> that seems to be some US attitude, no wonder what happens there with
> user attitudes like "but at least their right to do so"
> the ISP by definition has exactly one right: get money for his service
> which is described as "route and transfer every package, don't look at
> it, don't mangle it, you have no business about the content of my traffic"

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