Clear any default examples and add the following rule to limit authenticated users to 99 emails per day: Scroll down until you find the section configuring smtpd_sender_restrictions. It typically looks like this: Modify that block to append check_policy_service inet:127.0.0.1:10040 right after permit_sasl_authenticated. This ensures postfwd checks authenticated users before they are completely cleared to send: […]
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