filter01.yourdomainprovider.net has no MX records.
Question and response
Question
dig filter01.yourdomainprovider.net. MX
Answer
The response has no answer records.
Authority
yourdomainprovider.net. 3600 SOA ns1.yourdomainprovider.net. hostmaster.yourdomainprovider.net. 2026020501 3600 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0