ns1.telekom.net has no MX records.
Question and response
Question
dig ns1.telekom.net. MX
Answer
The response has no answer records.
Authority
telekom.net. 600 SOA dns1.telekom.de. dnsadmin.t-systems.com. 2019034366 10800 1800 604800 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0