upgrde to 3.1.2, as 2.x had security issues and there's no support given

any longer to 2.x.

NOTE: kerberos support is dropped, kerberos guru please re-do it...


from ftp://ftp.qualcomm.com/eudora/servers/unix/popper/Release.Notes

Release Notes:

3.1
           Can now set server mode and kerberos service name using
        run-time options.
           Can now specify plain-text password handling when APOP is
        available using '-p 0|1|2|3' run-time option. 0 is default;
        1 means clear text passwords are never permitted for any user;
        2 means they are always permitted (even if an APOP entry exists),
        which allows them to be used as a fallback when clients don't
        support APOP); 3 means they are permitted on the local interface
        (127.*.*.*) only.
           Added '-D drac-host' run-time option to specify the drac host.
        Only valid if compiled with --enable-drac.  The default is
        localhost.
           Added '-f config-file' run-time option.  Additional run-time
        options are read from the specified file.  All current run-time
        options can now be set this way.  See INSTALL file for option
        names and syntax.
           Added '-u' run-time option to read '.qpopper-options' file in
        user's home directory.
           Added Kerberos V support.
           BULLDB access now uses usleep(3C) if available, resulting in
        many more access attempts with a shorter maximum delay.
           Added run-time options 'bulldb-nonfatal' (-B) and
        'bulldb-max-retries' to allow fine control over BULLDB access
        behavior.  'bulldb-nonfatal' allows a session to continue if
        the bulletin database can't be locked.  'bulldb-max-retries'
        sets the maximum number of attempts to lock the database.  This
        value should only be changed if you know if your system has
        usleep(3C) or not.  On systems with usleep(3C), this can be a
        large value (the default is 75).  On systems without usleep(3C),
        this should remain small (the default is 10).
           Added new ./configure flags (see INSTALL for more details):
              --enable-timing to write log records with elapsed time for
                   authentication, initialization, and cleanup.
              --enable-old-uidl to generates UIDs using old (pre-3.x)
                   style encoding.  This is only useful if you also set
                   NO_STATUS and have existing users with old (pre-3.x)
                   spool files and you want to keep the UIDs the same.
              --disable-status to prevent Qpopper from writing 'Status'
                   or 'X-UIDL' headers (sets NO_STATUS).  This forces
                   UIDs for each message to be recalculated in each
                   session.
              --enable-keep-temp-drop to prevents Qpopper from deleting
                   the temp drop files.
              --disable-check-pw-max to prevent Qpopper from checking
                   for expired passwords.
              --disable-old-spool-loc to not check for old .user.pop
                   files in old locations when HASH_SPOOL or HOMEDIRMAIL
                   used.
              --disable-check-hash-dir to not check for or create hash
                   spool directories.  Use this if you pre-create the
                   directories.
              --enable-server-mode-group-include=group to set server
                   mode for users in the specified group.
              --enable-server-mode-group-exclude=group to set server
                   mode OFF for users in the specified group.
              --enable-secure-nis-plus for use with secure NIS+.
              --disable-optimizations to turn off compiler optimizations.
              --with-kerberos5 for Kerberos V support (using patch from
                   Ken Hornstein).
              --enable-any-kerberos-principal to accept any principal in
                   the client request.
              --enable-kuserok to use kuserok() to vet users.
              --enable-ksockinst to use getsockinst() for Kerberos
                   instance.
              --enable-standalone to create standalone POP daemon instead
                   of being run out of inetd.  Can specify IP address
                   and/or port number to bind to as parameter 1, e.g.,
                   'popper 199.46.50.7:8110 -S' or 'popper 8110 -S -T600'.
                   If not specified, IP address defaults to all available.
                   The default port is 110 except when _DEBUG (not simply
                   DEBUG) is defined, then it is 8765.
              --enable-auth-file=path to permit access only to users listed
                   in the specified file.  Format is one user per line.
              --enable-nonauth-file=path to deny access to users listed in
                   the specified file.  Format is one user per line.
              --disable-update-abort to avoid the default behavior of going
                    into update mode if the session aborts (the default
                    behavior violates of RFC 1939, but was found to be
                    needed when noisy dialup lines otherwise prevented users
                    from ever deleting messages).
                                            ([RCG])

3.0
           Both dot-locking and flock() now used on all platforms.  (On some
        systems we emulate flock() using fcntl).
           Added POP3 extensions(CAPA). The extensions added so far are
        X-MANGLE, LOGIN-DELAY and EXPIRE.
           X-MANGLE condenses Mime messages into a single part for ease of
        use by lightweight clients. The transformations supported through
        X-MANGLE are to and from text/plain, format=flowed, and text/html.
           As a way to enable MIME-mangling with clients that do not
        support XMANGLE, add "-no-mime" to the user name.  For example,
        if the userid is"mary", enter it in the client as "mary-no-mime".
           The optional LOGIN-DELAY and EXPIRE values are only announced
        through the CAPA command.  The values to announce are passed as
        command line switches.  Actual enforcement of minimum login delay
        and message expiration is up to the site by some other means.
        (For example, a simple script run from crontab could be used for
        message expiration.)  Qpopper does support automatic deletion of
        downloaded messages through the --enable-auto-delete configure
        flag.  This can be used to effect EXPIRE 0 (no retention).
           Added new run-time options: -R to disable reverse-lookups on client
        IP addresses; -c to downcase user name.
           A failure at some point in a transaction now releases all locks
        explicitly. Certain paths do not release locks where SysV .lock files
        are created.
           Fixed bugs with Bulletin Services and Server mode.
           DEBUGn macros for debug and trace messages.
           Added new ./configure flags (see INSTALL for more details):
              --with-warnings for extra compiler warnings.
              --enable-shy to hide qpopper's version number in the
                    banner and CAPA IMPLEMENTATION tag.
              --enable-auto-delete to automatically mark for deletion
                    all messages downloaded with RETR.
              --enable-hash-spool=1|2 to use hashed spool directories.
              --enable-home-dir-mail=file to use a spool file in the
                   user's home directory.
              --enable-bulldb=path to enable bulletins and set the path
                   for the bulletin directory.
              --with-new-bulls=number to specify the maximum number
                   of bulletins for new users (default is 10).
              --enable-popbulldir=path to specify an alternate location
                    for users' popbull files.
              --enable-log-login to log successful user logins.  This
                   can be used, for example, to validate subsequent
                   SMTP sessions from the same IP address within a
                   short time period, in the absence of SMTP AUTH
                   support by client and server. (Suggested by Andy
                   Harper et al).
              --with-pam=service-name to authenticate using PAM (based
                    on patch contributed by German Poo).
              --with-log-facility=name to specify the log facility.
                    Default is LOG_LOCAL1 or LOG_MAIL, depending on the
                    OS.
              --enable-uw-kludge to check for and hide a UW IMAP status
                    message.
              --enable-group-bulls to show bulletins by groups (group
                    name is second element in bulletin name).  Based on
                    patch by Mikolaj Rydzewski.
              --enable-timing to report timing information in the log.
              --enable-drac to use DRAC.  Based on patches by Mike
                    McHenry, Forrest Aldrich, Steven Champeon, and others.
           Added file popper/banner.h -- modify this file to add a custom
        banner and CAPA IMPLEMENTATION tag suffix.  Note that if you modify
        qpopper you should indicate this using banner.h.
           Improved error messages and warnings: warning "Unable to get
        canonical name of client" now includes IP address of client; logging
        added for I/O errors and discarded input (line too long); added errno
        to POP EOF -ERR message; "Possible probe of account" warning now logged
        as WARNING, not CRITICAL.

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