_spf.nexxera.com has no MX records.
Question and response
Question
dig _spf.nexxera.com. MX
Answer
The response has no answer records.
Authority
nexxera.com. 600 SOA ns003.nexxera.com.br. hostmaster.nexxera.com. 2026021801 7200 900 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0