postfix (*) presents the right "rcpt to a...@aaa.com" to the milter filter,
but sieve only sees the internal b@bbb.local.

Why convert/alias a...@aaa.com to b@bbb.local?
Why not setup dovecot to have a mailbox and receive mail for a...@aaa.com, 
allowing sieve to run for a...@aaa.com, and users login as a...@aaa.com on IMAP 
to check their mail?
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