mailrelay.t1cloud.com has no CNAME records.
Question and response
Question
dig mailrelay.t1cloud.com. NS
Answer
The response has no answer records.
Authority
t1cloud.com. 332 SOA ns-1774.awsdns-29.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0