I received an email that my zone has now access to email routing beta.
I followed the instructions, added a custom & destination address, verified the destination address, updated the MX records and sent a test email to the custom address, but it failed with the message:
Sorry, we were unable to deliver your message to the following address:
550: 5.1.1 Domain does not exist
Tried again after 1 1/2 hour but no good.