How to forward emails addressed to a specific domain?

Question

linux

There are two mailers (servers) serving one domain.
In fact, one server no longer serves, and everything has been fixed in the DNS, but letters still sometimes come.
I would like to write a beautiful rule in postfix so that all mail domain.rugoes to another server, something like this:

relay_domains = domain.ru
relay_transport = hash:/etc/postfix/transport
transport_maps = hash:/etc/postfix/transport

cat "/etc/postfix/transport"
domain.ru smtp:mail.domain.ru:25

Specifically, this rule does not work, the sender receives a whack - Relay access denied

Answer 1

Does mydestination have this domain?