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       courierpop3d - The Courier POP3 server


       /usr/sbin/couriertcpd {-nodnslookup} {-stderr=syslog} {110}


       This is a simple POP3 server for Maildirs.

           The couriertcpd, courierpop3login, and courierpop3d modules may be
           installed elsewhere than indicated here.

       courierpop3login is usually started by couriertcpd. It already expects
       that a POP3 client is connected to standard input and output,
       presumably via a network socket.  courierpop3login reads the POP3
       userid and password, then runs the authentication modules. The
       remaining arguments are passed along as arguments to modules.

       modules is one or more authentication modules (see the authlib(7)[1]
       manual page).

       Each authentication modules runs the program specified by its first
       argument, allowing the authentication modules to be chained. The last
       program in the chain is courierpop3d , which provides the actual POP3
       service. In accordance with the authentication protocol, as described
       in authlib(7)[1] courierpop3d reads file descriptor 3 to see if the
       userid/password has been succesfully validated. If not, courierpop3d

       Otherwise, courierpop3d expects to be already running under the
       appropriate user and group id, with its current directory set to the
       account´s home directory.

       The first order of business is to find the account´s Maildir. If the
       environment variable MAILDIR is set, that´s where we go. That should be
       the pathname to the account´s Maildir. The environment variable MAILDIR
       may be set by the authentication module. If MAILDIR is not set,
       courierpop3d uses its first argument. Usually, the default maildir is
       $HOME/Maildir, therefore the first argument to courierpop3d is


       authlib(7)[1], userdb(8)[2].


        1. authlib(7)
           [set $man.base.url.for.relative.links]/authlib.html

        2. userdb(8)
           [set $man.base.url.for.relative.links]/userdb.html