On Thu, Aug 22, 2024 at 08:44:33PM +0800, horizon--- via Postfix-users wrote:

> I am sorry that I have asked this question on dovecot list, but I got no
> answer there. So I am forwarding this to postfix list hoping I can get your
> help.

Is it *authentication* you want to disable, or the right to submit
messages?  It may be simpler to just deny submission for some
authenticated users:

    smtpd_sender_restrictions =
        check_sasl_access inline:{
                { user1 = reject },
                { user2 = reject },
                ...
            },
        permit_sasl_authenticated,
        reject

-- 
    Viktor.
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