We are experiencing an error when sending a message through Zoho Mail (Unable to send message;Reason:553 Relaying disallowed. Invalid Domain - lexdigital.com.br) but you can check here that the MX is correct https://mxtoolbox.com/SuperTool. aspx?action=mx%3aledigital.com.br&run=toolpage

as well as SPF https://mxtoolbox.com/SuperTool.aspx?action=mx%3aledigital.com.br&run=toolpage

what is happening? How do I solve it?