Brian A. Seklecki writes:
AUTH_REQUIRED=1 means that anyone connecting to your mail server must authenticate....and the only reason that would ever be configured as such is if no local deliveries were to ever happen? E.g., an "outbound only" mail server, perhaps in a cluster.
Not necessarily. For example, the incoming mail is MXed to another server, which does some filtering of sorts, before forwarding the mail to the primary mail server. To prevent port-scanning malware from bypassing the filter, and dumping the load directly into the primary, you enable authentication and have the incoming server forward all mail to the primary after authenticating.
That's just one possible situation I can think of. I'm sure there are others.
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