Yes, that is correct Thomas.
Sam responded earlier stating that you can control access to the Courier mail server using the smtpaccess file. However, that still doesn't prevent mail coming from unwanted hosts "to" users on the mail server, right? I think that smtpaccess only controls relaying? Or maybe I'm wrong - maybe it will reject a host that is listed in the file from even connecting (but I don't think that is correct).
All of the above statements are true.
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