ns3.virtual1.co.uk has no MX records.
Question and response
Question
dig ns3.virtual1.co.uk. MX
Answer
The response has no answer records.
Authority
virtual1.co.uk. 3600 SOA ns3.virtual1.com. hostmaster.virtual1.com. 2019040736 14400 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0