ego...@gmail.com:
> Hi everybody, is it possible to define a transport map based on
> recipient mail server address instead of recipient domain?

Postfix reads the transport map before it knows the server IP address.

You can override the transport map with a FILTER command.
However:
- This works only for mail received with SMTP.
- If a message has multiple recipients, the last FILTER command wins.

/etc/postfix/main.cf:
    smtpd_recipient_restrictions =
        # must go before permit_mynetworks
        check_recipient_mx_access hash:/etc/postfix/rcpt_mx_access
        permit_mynetworks
        reject_unauth_destination

/etc/postfix/rcpt_mx_access
    123.456.123.456 FILTER smtp:[relayhost.com]

        Wietse

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