sisko.supramail.com.br has no MX records.
Question and response
Question
dig sisko.supramail.com.br. MX
Answer
The response has no answer records.
Authority
supramail.com.br. 300 SOA janeway.mav.com.br. daniel.mav.com.br. 2022032219 3600 900 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0