warning-security.landing.telstra.com has no MX records.
Question and response
Question
dig warning-security.landing.telstra.com. MX
Answer
The response has no answer records.
Authority
telstra.com. 900 SOA adns05.bigpond.com. hostmaster.telstra.net. 2026022004 7200 1800 7200000 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0