c.ns.as29550.net has no MX records.
Question and response
Question
dig c.ns.as29550.net. MX
Answer
The response has no answer records.
Authority
as29550.net. 3600 SOA a.ns.as29550.net. hostmaster.as29550.net. 2019071513 14400 1800 1209600 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0