LOCAL_USER mc Macro
Some unqualified usernames (names without an @host part) need to be delivered on the local machine even if LOCAL_RELAY is defined. The user root is one such example. By remaining local, aliasing is allowed to take place.
The LOCAL_USER mc macro is used to add additional usernames to the list of local users. Note that prior to V8.12, root was always a member of that list:
LOCAL_USER(`operator') LOCAL_USER_FILE(`path') ← V8.12 and later
Here, the first line causes the name
operator to be appended to
the list of local users. The second line causes the
list of local users to be read from the file named
path. The disposition
of local usernames, which include the domain of the
local host is determined by the stickyhost feature
(FEATURE(stickyhost) on page 642).
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