reject unknown recipient (postfix)

вот чего пишут в официальной доке

smtpd_reject_unlisted_recipient (default: yes)
Request that the Postfix SMTP server rejects mail for unknown recipient addresses, even when no explicit reject_unlisted_recipient access restriction is specified. This prevents the Postfix queue from filling up with undeliverable MAILER-DAEMON messages.
* The recipient domain matches $mydestination, $inet_interfaces or $proxy_interfaces, but the recipient is not listed in $local_recipient_maps, and $local_recipient_maps is not null.
* The recipient domain matches $virtual_alias_domains but the recipient is not listed in $virtual_alias_maps.
* The recipient domain matches $virtual_mailbox_domains but the recipient is not listed in $virtual_mailbox_maps, and $virtual_mailbox_maps is not null.
* The recipient domain matches $relay_domains but the recipient is not listed in $relay_recipient_maps, and $relay_recipient_maps is not null.
This feature is available in Postfix 2.1 and later.

проверил у себя, все так... а письмо высылается вместо дропа соединения :(

Давно не ковырял postfix, но по-моему reject и drop вещи разные