mx.tomdavis.me has no MX records.
Question and response
Question
dig mx.tomdavis.me. MX
Answer
The response has no answer records.
Authority
tomdavis.me. 3600 SOA dns.tomdavis.me. hostmaster.tomdavis.me. 1835823019 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0