web.netshield.uk has no MX records.
Question and response
Question
dig web.netshield.uk. MX
Answer
The response has no answer records.
Authority
netshield.uk. 1800 SOA audrey.ns.cloudflare.com. dns.cloudflare.com. 2394183431 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0