mail.toob.co.uk has no MX records.
Question and response
Question
dig mail.toob.co.uk. MX
Answer
The response has no answer records.
Authority
toob.co.uk. 600 SOA pdns05.domaincontrol.com. dns.jomax.net. 2026022501 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0