Access Control Identifier (ACI)¶
The Access Control Identifier (ACI) part of an ACL entry specifies the user or group for which the entry applies. Group identifiers are distinguished be the prefix "group:". For example, "group:accounting".
There are two special identifiers, "anonymous", and "anyone", which are
explained below. The meaning of other identifiers usually depends on
the authorization mechanism being used (selected by
compile time, defaulting to Unix).
With any authorization mechanism, two special identifiers are defined.
anonymous refers to the anonymous, or unauthenticated
user. The identifier
anyone refers to all users, including the
anyone may commonly be used with the post
p to allow message insertion to mailboxes.