rep2.card-smith.com has no MX records.
Question and response
Question
dig rep2.card-smith.com. MX
Answer
The response has no answer records.
Authority
card-smith.com. 3600 SOA ns1-06.azure-dns.com. root.card-smith.com. 2033457178 7200 3600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0