If that doesn't work - different approach, using only restrictions, e.g.
smtpd_recipient_restrictions = permit_mynetworks [...]
reject_unauth_destination
check_recipient_access hash:/etc/$config_directory/my_domains
my_domains:
example.internal 521 Unauthorized
- do no accept recipients in @example.internal for smtpd, assuming you
have separate smtpd_recipient_restrictions set for submission service,
which you should have already (the one with permit_sasl_authenticated).
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