ns4.blinktelecom.com.br has no MX records.
Question and response
Question
dig ns4.blinktelecom.com.br. MX
Answer
The response has no answer records.
Authority
blinktelecom.com.br. 3600 SOA ns1.blinktelecom.com.br. contato.blinktelecom.com.br. 2026022501 3600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0