Laz C. Peterson:
> Hello Postfix community,
> 
> I have a puzzling setup that I am trying to work out, maybe someone has some 
> advice or idea?
> 

What about:

submission service - pre/post-queue filter -\           /- outbound SMTP
                                             -- queue --
        mx service - pre/post-queue filter -/           \- dovecot

(best viewed in fixed-width font).

Each component of this picture can be replicated as many times as
needed. That is, multiple filters can share the same queue, or 
each filter can send to a dedicated queue.

        Wietse

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