I have changed my MX records but still I am not able to receive mail?

I have changed my MX records but still I am not able to receive mail?

Domain: www.montemt.com.br

The DNS server is publishing the same MX zones registered in the DirectAdmin panel:
https://mxtoolbox.com/SuperTool.aspx?action=mx%3amontecmt.com.br&run=toolpage