Problem with a certain domain

[Thomas Barth]

Am 2024-06-04 09:50, schrieb Matus UHLAR - fantomas:
> On 03.06.24 18:46, Thomas Barth via bind-users wrote:
>> Should I perhaps ask the mail user to unsubscribe from this website 
>> due to troubles of bad configuration?
> 
> 
> yeah I guess you should, their DNS servers are pretty much messed up:

A temporary solution :-)

/etc/postfix/access-sender
newsletter.mallorcazeitung.es 550 Please configure your ns correctly
[...]

So, what I still don't understand is why it works on one server and not 
on the other. And this depends on which network the server is on? Bind 
is configured the same on all my servers. Shouldn't Bind then be 
confronted with the problem on all servers? How do I get a really 
uniform configuration?