static.ritesim.com has no MX records.
Question and response
Question
dig static.ritesim.com. MX
Answer
The response has no answer records.
Authority
ritesim.com. 3600 SOA ns1.livedns.co.uk. admin.ritesim.com. 1539010586 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0