It lists usernames in an external file, one name
per line, and is declared like this:
EXPOSED_USER_FILE(`/etc/mail/exposedusers??)
This declaration causes a list of users to be read from the file /etc/mail/exposedusers.
Because EXPOSED_USER_FILE is implemented withan F configuration command
(?§22.1.2 on page 857), you can add whatever F command arguments you desire. For
example:
EXPOSED_USER_FILE(`-o /etc/mail/exposedusers??)
Here the -o switch makes the presence of the /etc/mail/exposedusers file optional.
If you are currently reading exposed users from a file declared withth e F configuration
command, you are encouraged to convert to this new macro. Use of it will insulate
you from change in the future if a different class name is ever used.
17.4.2 MASQUERADE_AS mc Macro
At sites withone central mail server (see MAIL_HUB, ?§17.5.7 on page 605), it can be
advantageous for mail to appear as though it is from the hub. This simplifies mail
administration in that all users have the same machine address no matter which
workstations they use. You can cause a workstation to masquerade as the server (or
as another host) by using the MASQUERADE_AS mc macro:
MASQUERADE_AS(`server??)
This causes outgoing mail to be labeled as coming from the server (rather than from
the value in $j, ?§21.9.59 on page 830). The new address appears in the sender headers
(suchas From:) but specifically does not appear in the Received: (?§25.
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