ns.pflegedienst-johnson.com has no MX records.
Question and response
Question
dig ns.pflegedienst-johnson.com. MX
Answer
The response has no answer records.
Authority
pflegedienst-johnson.com. 3600 SOA ns.pflegedienst-johnson.com. mail.pflegedienst-johnson.com. 105 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0