dns3.nominetdns.uk has no MX records.
Question and response
Question
dig dns3.nominetdns.uk. MX
Answer
The response has no answer records.
Authority
nominetdns.uk. 3600 SOA dns1.nominetdns.uk. hostmaster.nominet.org.uk. 1710842253 900 300 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0