198.Red-154.58.16.staticIP.cloud4b.net has no MX records.
Question and response
Question
dig 198.Red-154.58.16.staticIP.cloud4b.net. MX
Answer
The response has no answer records.
Authority
cloud4b.net. 300 SOA dns27.servidoresdns.net. hostmaster.servidoresdns.net. 2013010320 21600 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0