I recently got access to the Email Routing Beta and tried it out.
Unfortunately my Postfix server is rejecting relayed messages due to the addresses being rewritten, as others have mentioned here “name=sender.tld(at)mydomain.tld”.
NOQUEUE: reject: RCPT from a2-74.email.cloudflare.net[22.214.171.124]: 550 5.1.0 <name=sender.tld(at)mydomain>: Sender address rejected: User unknown in virtual mailbox table; from=<name=sender.tld(at)mydomain> to=<myrecipientaddress> proto=ESMTP helo=<a2-74.email.cloudflare.net>
Is this something one needs to configure in Postfix? Obviously I can’t create a mailbox for every possible email address…