On Wed, Aug 24, 2022 at 09:32:10PM +0300, Ivars Strazdins wrote:

> Sorry if I replied to the list twice, but Noel’s advice nailed it.
> "check_recipient_access=hash:/etc/postfix/protected_destinations" must
> be added to master.cf smtps and submission, then sending is not
> allowed.

More precisely:

    master.cf:
        submission inet ... smtpd
            ...
            -o smtpd_recipient_restrictions=$submission_recipient_restrictions
            ...
        submissions inet ... smtpd
            ...
            -o smtpd_recipient_restrictions=$submission_recipient_restrictions
            ...

    main.cf:
        indexed = ${default_database_type}:${config_directory}/

        submission_recipient_restrictions =
            check_recipient_access ${indexed}protected_recipients

        smtpd_restriction_classes = protected_list

        protected_list = ...
            check_sender_access ${indexed}list_senders,
            reject

    protected_recipients:
        l...@example.com    protected_list

    list_senders:
        ...

-- 
    Viktor.

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