ns1.darl.com has no MX records.
Question and response
Question
dig ns1.darl.com. MX
Answer
The response has no answer records.
Authority
darl.com. 3600 SOA ns1.darl.com. ron.darl.com. 2025100600 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0