[Exim] Exim auth tips

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In order to send the login and password to a smarthost I'm using this small tips in client_send property.

begin authenticators
xchang:
        driver = plaintext
        public_name = LOGIN
        server_prompts = "Username:: : Password::"
        server_condition = "${if pam {$1:$2}{1}{0}}"
        server_set_id = $1:$2
        client_send = "${extract{1}{::}{$authenticated_id}} : ${extract{2}{::}{$authenticated_id}}"

This is working well but if I'm using an additional software like Amavisd-new.... This won't work anymore. I've configured Amavisd-new to use an smtp connection so AUTHENTICATED_ID variable become empty.

So my question is : How to keep / save this variable for a future use ?

Anyone can help me ?

Thanks


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