outgoing-interface control

[Sonic]

Is there any way to specify which outgoing-interfaces are used for which
purpose?

According to the documentation: Outgoing queries are sent via a random
outgoing interface to counter spoofing.

However, this is not ideal when you have stub-zone hosts and/or
forward-zone hosts on separate interfaces. For example a router running an
Unbound cache for a local network where an outside forwarder is available
via the external interface and stub-zone hosts are available via internal
(or other external) interfaces. Unbound will randomly select the from:
address independent of the actual destination.

It would be ideal to tie outgoing interfaces to particular zones (at least
I think so). Is there any way to accomplish this, or what have I overlooked?

Thank you,
Chris
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