as usual, the problem's seldom where you 1st look.

*NO* need for _any_ changes to queries.

the source of the problem was my local postfix submission instance's config -- 
connected to, as submission_relay_host, by dovecot.

it was doing exactly what I'd told it to do ... NOT expanding alias address 
mappings.

ensuring that

        no_address_mappings

is removed from

        receive_override_options=

, whether in main.cf, or in the instance's config in master.cf, does the trick.

i.e., pebkac.

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