mail2.ukfast.net has no MX records.
Question and response
Question
dig mail2.ukfast.net. MX
Answer
The response has no answer records.
Authority
ukfast.net. 300 SOA ns0.ukfast.net. support.ukfast.net. 2026022503 7200 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0