I made a gmail for my business, then I created a custom one to route it with the gmail one. But even if I did it correctly (I have another domain with different email that I route it succesfully) I don´t receive any emails on the gmail one therefore neither in the domain email.
If your email forwards to [email protected], be sure to test it using a different account. Do not send from the same gmail account that the mail gets forwarded to. Gmail sometimes does not show these emails.