17 Aug
2021
17 Aug
'21
9:05 p.m.
Crazy as it sounds that could be the reason. Have you a static IP and have you had it a
long time?
Sent from ProtonMail for iOS
On Tue, Aug 17, 2021 at 19:19, Thomas DeBellis <tommytimesharing at gmail.com>
wrote:
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
>
>