Sent from ProtonMail for iOS
On Tue, Aug 17, 2021 at 19:19, Thomas DeBellis
<tommytimesharing at
The only thing that comes to mind immediately
would be some kind of
misguided attempt to mitigate possible DOS attacks via white listing.
On 8/16/21 9:04 PM, Paul Koning wrote:
> On Aug 16, 2021, at 6:36 PM, Mark <mwjr at protonmail.com> wrote:
>
> Mystery solved (or at least the mystery of no response) - I used to
have some
issues when I ran authoratitive DNS and mail directly from
our school's IP addresses rather than an 'established' (big tech co)
source
Why would that explain the failure to answer DNS
queries? DNS
servers are supposed to answer queries from everyone. I've never
heard
of failing to do so. FWIW, I just tried asking ns1.protonmail.ch about
mail.protonmail.ch, and it was happy to answer me (to my random
Comcast client addresses, IPv4 and IPv6 both work).
>
> paul
>
>