smtp.brunet.BN has no MX records.
Question and response
Question
dig smtp.brunet.BN. MX
Answer
The response has no answer records.
Authority
brunet.BN. 86400 SOA te02.brunet.BN. dnsadmin.brunet.BN. 2014092217 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0