Again, I've got fetchmail feeding into postfix so all my clients can access my local mailhost with imap. But all the clients are configured to upload direct to my ISP or wherever because I tried to (and couldn't) get postfix to collect and upload email.
The OP's problem is even worse because he doesn't have just one upstream provider. You've missed he wants postfix to choose between several upstreams based on a ruleset.
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