mail.tiscali.co.uk has no MX records.
Question and response
Question
dig mail.tiscali.co.uk. MX
Answer
The response has no answer records.
Authority
mail.tiscali.co.uk. 3600 SOA ns0.tiscali.co.uk. hostmaster.talktalkplc.com. 2016031700 10800 3600 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0