fb.suantispam.com has no MX records.
Question and response
Question
dig fb.suantispam.com. MX
Answer
The response has no answer records.
Authority
fb.suantispam.com. 3600 SOA dns1.spamrl.com. hostmaster.spamrl.com. 2025051903 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0