Hi,
I have a postfix-3.5.10 system and am trying to process mail prior to
it being forwarded to another domain that has multiple MX records.
Many years ago I used fallback_relay in master.cf but now it appears
to be referenced as smtp_fallback_relay?

I don't understand the syntax for adding multiple relays and whether
I'm even doing it the right way.

master.cf:
orion   unix    -       -       n       -       -       smtp
        -o smtp_fallback_relay=192.168.10.10,192.168.11.11

relay_domains = $mydestination, example.com, example1.com

transport:
example.com        orion:192.168.9.9

Also, on a somewhat related note, is it possible to configure a
transport for relay_domains and a separate transport for
virtual_alias_domains?

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