Incorrect email address

Hello George,

Thanks for your useful reply.

I have managed to create an email address and apply the forwarding.

Now a test mail message fails to deliver. Error message.

521 5.3.0 Upstream error, please check https://developers.cloudflare.com/email-routing/postmaster for possible reasons why. m7Gi7ya1Yc4x

I am not very technically minded so struggle to decipher the meaning.

Any help will be appreciated.

Thanks and regards

Herman