Provided by: courier-pop_0.47-13ubuntu5_i386 bug


       courierpop3d - Courier POP3 server


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


       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)
       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)  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 "./Maildir".


       authlib(7), userdb(8).