mailout.artfiles.de has no MX records.
Question and response
Question
dig mailout.artfiles.de. MX
Answer
The response has no answer records.
Authority
mailout.artfiles.de. 360 SOA auth1.artfiles.de. hostmaster.artfiles.de. 2025092401 28800 14400 806400 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0