bn has no MX records.
Question and response
Question
dig bn. MX
Answer
The response has no answer records.
Authority
bn. 900 SOA ns1.bnnic.bn. postmaster.bnnic.bn. 2014363443 21600 1800 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0