Nikolaos Milas: >to force relaying to*both* those servers (mail AND mail2) at the >same time? According to the documentation, I don't see that's >possible (it seems only one transport:nexthop definition is >acceptable), but can we achieve this somehow (except using >always_bcc on mail.example.com)?
Recipient splitting, i.e. delivering one recipient "simultaneously" to multiple servers violates Postfix design and will not be supported. To implement an HA message store, implement an HA data store and make it accessible via multiple paths. Wietse