If you want to run Postfix as a blackhole mail server (accepting connection for every user on every domain) then all you have to do is add these settings to /etc/postfix/main.cf :
relayhost = relay_transport = relay relay_domains = static:ALL smtpd_end_of_data_restrictions = check_client_access static:discard
Note: Postfix is not acting as an open relay in this configuration because it discards mails and is not relaying them to the final destination.
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It would be interesting, instead of throwing mails away, to feed them to spamassassin, learning as spam.
Indeed! However this setup was meant to be run in a development environment, testing mail flows from different web applications and not actually sending things out to the Internet.
Thanks ! This was exactly what I was looking for. (and for the same reason, just a development environment that should never send emails)