dns4.itsweb.com.br has no MX records.
Question and response
Question
dig dns4.itsweb.com.br. MX
Answer
The response has no answer records.
Authority
itsweb.com.br. 10800 SOA dns9.itsweb.com.br. redes.itsbrasil.net. 2026011502 10800 3600 1382400 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0