mail.vxsbill.com has no MX records.
Question and response
Question
dig mail.vxsbill.com. MX
Answer
The response has no answer records.
Authority
vxsbill.com. 3600 SOA ns1.virtualxs.com. hostmaster.virtualxs.com. 2023122701 7200 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0