proxy.afas.online has no MX records.
Question and response
Question
dig proxy.afas.online. MX
Answer
The response has no answer records.
Authority
afas.online. 3600 SOA ns0.leaseweb.nl. postmaster.leaseweb.nl. 2018031302 14400 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0