dell710-978.rapidns.com has no MX records.
Question and response
Question
dig dell710-978.rapidns.com. MX
Answer
The response has no answer records.
Authority
rapidns.com. 86400 SOA ns1.rapidns.com. hostmaster.rapidns.com. 2026021000 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0