chrelay00.invalidemail.com has no MX records.
Question and response
Question
dig chrelay00.invalidemail.com. MX
Answer
The response has no answer records.
Authority
invalidemail.com. 300 SOA ns1.p201.dns.oraclecloud.net. hostmaster.invalidemail.com. 598305965 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0