NAME

       courierpop3d - The Courier POP3 server

SYNOPSIS

       /usr/sbin/couriertcpd {-nodnslookup} {-stderr=syslog} {110} {/usr/lib/courier/courier/courierpop3login}
                             [modules...] {/usr/lib/courier/courier/courierpop3d} {./Maildir}

DESCRIPTION

       This is a simple POP3 server for Maildirs.

           Note
           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
       terminates.

       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
       "./Maildir".

SEE ALSO

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

AUTHOR

       Sam Varshavchik
           Author

NOTES

        1. authlib(7)
           http://www.courier-mta.org/authlib.html

        2. userdb(8)
           http://www.courier-mta.org/userdb.html