mx.cti.eco.br has no MX records.
Question and response
Question
dig mx.cti.eco.br. MX
Answer
The response has no answer records.
Authority
cti.eco.br. 300 SOA dns1.ctitech.net.br. postmaster.ctitech.net.br. 2025102402 28800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0