stop-rev-01.uni5.net has no MX records.
Question and response
Question
dig stop-rev-01.uni5.net. MX
Answer
The response has no answer records.
Authority
stop-rev-01.uni5.net. 3600 SOA dns1.uni5.net. abuse\@kinghost.com.br.stop-rev-01.uni5.net. 1982080901 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0