spamguard.bracnet.net has no MX records.
Question and response
Question
dig spamguard.bracnet.net. MX
Answer
The response has no answer records.
Authority
bracnet.net. 3600 SOA dns1.bdmail.net. root.dns1.bdmail.net. 2025090702 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0