A postfix is used to inform the system which authentication option to be used for authenticating an account
(e.g. bob@BostonLdap or tim@TaipeiRadius) when multiple options are concurrently in use. One of
authentication option can be assigned as default. For authentication assigned as default, the postfix can be
omitted. For example, if "BostonLdap" is the postfix of the default option, Bob can login as "bob" without
having to type in "bob@BostonLdap".
5.2.2 Login with postfix
Set a postfix that is easy to distinguish (e.g. Local) user login with which authentication server. The
acceptable characters are numbers (0~9), alphabets (a~z or A~Z), dash (-), underline (_) and dot (.) within a
maximum of 40 characters. All other characters are not allowed.
Beside the Default Authentication, all other authentication server users login to system, the username must
contain the postfix to identify the user is belong to which authentication server.
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