Andr? H?nsel <andre@webkr.de> wrote:
> Hi,
>
> I set up postfix with relay_domains and transport_maps, so it acts as
> backup MX and relays mail for certain domains. I don't want to
> configure the specific mail accounts on the backup MX.

you don't have to define mail accounts on a backup server, just the
domains it will queue for, and this can even be done without configuring
specific domains.

> The primary MX rejects mails to invalid recipients during SMTP
> conversation with a permanent error. In this cases Postfix sends a
> failure report to the original sender.
>
> Can I tell it to silently ignore the permanent error and discard the
> mail?

So you don't want any mail that should bounce to be send back to the
sender at all, ever?