It appears the trick for this is setting local_interfaces = ''
as in the following config file.
Someone let me know if there is a preferred method. Thanks.
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# seemingly only way to avoid "lowest numbered MX record points to local host"
local_interfaces =
# order matters, process till address accepted
begin routers
# all messages go to their MX defined server
dnslookup:
driver = dnslookup
transport = remote_smtp
# one transport called per router
begin transports
remote_smtp:
driver = smtp
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