mail.ar-star.com has no MX records.
Question and response
Question
dig mail.ar-star.com. MX
Answer
The response has no answer records.
Authority
ar-star.com. 602 SOA ns.ar-star.com. postmaster.ar-star.com. 2026022103 1202 120 2419200 84800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0