app03.feeddex.net has no MX records.
Question and response
Question
dig app03.feeddex.net. MX
Answer
The response has no answer records.
Authority
feeddex.net. 300 SOA ns1.shockmedia.nl. hostmaster.shockmedia.nl. 2022021501 10800 1800 345600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0