And I tried to send email to firstname.lastname@example.org, but it failed with:
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.1.1 <email@example.com>: Recipient address rejected: User unknown in local recipient table (state 14).