dnssec-analyzer.verisignlabs.com aaaa lookup fail

[Mark Andrews]

> On 30 Apr 2024, at 13:39, Walter H. via bind-users <bind-users at lists.isc.org> wrote:
> 
> On 29.04.2024 22:19, Lee wrote:
>> On Sun, Apr 28, 2024 at 2:18 AM Walter H. via bind-users
>> <bind-users at lists.isc.org> wrote:
>> 
>> something that I replied to and got this in response:
>> 
>> Error Icon
>>  Message blocked
>> Your message to Walter.H@[..snip..] has been blocked. See technical
>> details below for more information.
>> 
>> The response from the remote server was:
>> 554 5.7.1 : Client host rejected: Use IPv4
>> 
>> 
> For explanation: this is MY mail server, which blocks IPv6 connections from
> 
> Outlook.com
> Gmail.com
> ...
> 
> as these are the biggest SPAM senders

As far as I know they deliver email over both IPv4 and IPv6 (spam and ham) independently
of the transport.  The only thing that blocking one transport like this does is cause email
to be unreliable.  The sender has no control over the transport protocol used.

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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org