threembb.co.uk has no MX records.
Question and response
Question
dig threembb.co.uk. MX
Answer
The response has no answer records.
Authority
threembb.co.uk. 3600 SOA dnsxau.threembb.net. rnamehostmaster.three.co.uk. 2016182228 1200 300 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0