Hello, i create my MX record “mx.epizy.com” with my domain, but also i can´t erase de default, an MX record " mx.byetcluster.com. priority 0" . when i put delete says Error #459346986 Please contact supportMX Records can not be altered on subdomains. And probably this is the reason why when i´m triying to put the password on gmail to configure de email don´t recognaized it. Please Help ! i appreciated
MX Records can not be altered on subdomains
I think that answers your first question.
As for the second question, see: https://infinityfree.net/support/pop-imap-smtp/