Problem with a certain domain

[Thomas Barth]

Hello,

I cannot send them an email to inform about a dns problem. The mail gets 
stuck in the queue.

postqueue -p
(Host or domain name not found. Name service error for name=mx.renr.es 
type=A: Host not found, try again)
                                          red at mallorcazeitung.es


Bind reports a communication error.

dig mx.renr.es
;; communications error to 127.0.0.1#53: timed out

I could enable the bind logging:

03-Jun-2024 18:34:22.681 client @0x7f014c88ed68 127.0.0.1#54496 
(mallorcazeitung.es): query: mallorcazeitung.es IN MX +E(0)K (127.0.0.1)
03-Jun-2024 18:34:36.098 client @0x7f014ef48168 127.0.0.1#59706 
(mx.renr.es): query: mx.renr.es IN A +E(0)K (127.0.0.1)
03-Jun-2024 18:34:41.106 client @0x7f014dd71768 127.0.0.1#56423 
(mx.renr.es): query: mx.renr.es IN A +E(0)K (127.0.0.1)

Should I perhaps ask the mail user to unsubscribe from this website due 
to troubles of bad configuration?