I would assume you would just use mailing list mode and address additional recipients.  To receive an expert reply I would suggest you ask the question here:

https://meta.discourse.org/c/support

On Tue, Aug 27, 2019 at 10:54 AM Julen Landa Alustiza <jlanda@fedoraproject.org> wrote:
I'm curious about discourse's options here...

Is quite common on our workflows to have mailing threads that targets a couple of fedora mailing list, another outside mailing list and some third party individuals when we discuss about an specific feature.

The xen criteria one for example, it had been cross mailing test@, devel@, xen's third party mailing list and some amazon folks with direct CCs.

Is this possible with discourse?
Julen Landa Alustiza <jlanda@fedoraproject.org>
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