I am looking for a solution for following idea.
I have a mailserver with mydestination set to "one.example.com" and local mailboxes (no virtual) like email@example.com
I need emails to one user "firstname.lastname@example.org" not to be delivered to local mailbox, but to be forwarded as-it-is to another mail server.
For one server using transport table will be the easy solution, but I need to forward it to backupserver1 and if that is not available to backupserver2.
Using DNS MX entries is not really available, because for one.example.com is the mailserver defined.
Is this feasable by postfix itself ? maybe some smtp rewrite or another solution ?
thanks in advance