I activated routing email, it requested suppression of MX things to work. I did it and now I can’t send email anymore to my principal address. I can receive email to the address but can’t send to it, it say that the address don’t exist.
Cloudflare email routing does not provide a method for sending outbound email.
Are you trying to use Cloudflare Email Routing and another mailserver? You cant do that at the same domain namespace. Once you replace the other MX records with those required for Cloudflare Email Routing, you will only be able to deliver email to addresses that you have created in Cloudflare.
If you already have a mailserver for your domain, there is no reason to use Cloudflare Email Routing. You will be better off switching back to your previous MX setup.