gia.bt.net has no MX records.
Question and response
Question
dig gia.bt.net. MX
Answer
The response has no answer records.
Authority
gia.bt.net. 7200 SOA ns1eu.bt.net. hostmaster.eu.bt.net. 2018091758 28800 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0