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check_recipient_a_access DISCARD leads to 451 4.3.5 Server configuration error

Hello,

as described in the subject i tried to implement the new feature
check_recipient_a_access
I have encountered a strange error or maybe an bug.

The following settings result in an correct action follwed by an "4.3.5
Server configuration error" response.
# main.cf
smtpd_recipient_restrictions =
        reject_non_fqdn_sender
        ...
        check_recipient_a_access
hash:/etc/postfix/lookup/recipient_a_access
        ...
        permit

# cat /etc/postfix/lookup/recipient_a_access
185.140.110.3 DISCARD

# maillog
Nov 14 10:53:54 fallback postfix/smtpd[7187]: NOQUEUE: discard: