OK I've tracked it down and it has something to do with
/usr/lib/courier-imap/libexec/imapd.rc

For some reason, processes started by the imapd.rc file quits responding to
login requests for two particular email accounts.  Those email accounts are
accessed on any one of THREE separate computers.  If access to those
email accouns is lost, I can stop then start imapd.rc. Everything will work
for
a while.  Then after some unknown time period (it seems to correlate to an
increased number of machines that have accessed the account) the imap server
quits servicing those accounts.  Other accounts are still accessible, it's
just
those two.  (hmm..I may try to access other accounts from various
workstations and see what happens.  -more on that later I suppose) (ok it's
later now.  It seems that it's the problem is worse the closer together the
timing of mailbox queries are made.  It's acting like it's tying up the
login processes for those particular users........)

The users can STILL use sqwebmail to access their mailboxes.  That is one
way we verified the that the login information was correct.

As far as troubleshooting steps go, I wound up deleting and reinstalling
from scratch.  For verification and for those of you interested, here are
the
commands I used.

cd /usr/src/courier-imap-1.5.1;make uninstall; rm -r /usr/lib/courier-imap;
rm -r *; chmod -R 755 ~vpopmail/lib; su nonrootusr;
cd /usr/src; tar -zxvf /usr/download/courier-imap-1.5.1.tar.gz;
cd courier-imap-1.5.1.tar.gz; ./configure; make;make check;
exit #back to rootuser ; make install; make install-configure

(of course I didn't just execute that all on one line!  It was a step by
step procedure! :)  I guess I should have used install-strip instead. DANG
IT! )

Googling with the Outlook Express v6 error message (listed below) turns up
several links related to WU-IMAP, but sheds no light on what is happening
here.
Further spelunking reveals that no helpful login failure/troubleshooting
messages
seem to be recorded in /var/log/maillog.

When looking at the log file consider that a reset  of imapd.rc at ~16:52
shows
that the users can now check their mail/authenticate properly.

So.  any thoughts?  At this point I don't even know where I should be
looking.

-Richard

***** Supporting documentation below *****

[maillog]
Jul  2 16:49:03 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:49:08 RHL imapd: LOGIN FAILED, ip=[::ffff:192.168.1.100]
Jul  2 16:49:18 RHL imapd: LOGIN FAILED, ip=[::ffff:192.168.1.100]
Jul  2 16:49:20 RHL imapd: DISCONNECTED, ip=[::ffff:192.168.1.100],
headers=0, body=0
Jul  2 16:49:20 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:49:25 RHL imapd: LOGIN FAILED, ip=[::ffff:192.168.1.100]
Jul  2 16:49:43 RHL imapd: DISCONNECTED, ip=[::ffff:192.168.1.100],
headers=0, body=0
Jul  2 16:54:57 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:54:57 RHL imapd: LOGIN, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100]
Jul  2 16:54:59 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:54:59 RHL imapd: LOGIN, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100]
Jul  2 16:55:11 RHL imapd: LOGOUT, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100], headers=0, body=0
Jul  2 16:55:11 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:55:11 RHL imapd: LOGIN, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100]
Jul  2 16:55:25 RHL imapd: LOGOUT, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100], headers=0, body=0
Jul  2 16:55:25 RHL imapd: Connection, ip=[::ffff:192.168.1.100]
Jul  2 16:55:25 RHL imapd: LOGIN, [EMAIL PROTECTED],
ip=[::ffff:192.168.1.100]
[/maillog]

[packages running on this system]
Net_SSLeay.pm-1.17/
autorespond-2.0.2/
courier-imap-1.5.1/
ezmlm-0.53/
ezmlm-idx-0.40/
httpd-2.0.39/
linux-2.4.18/ **With the grsecurity patch version 1.9.4 (grsecurity.net)
qmail-1.03/
qmailadmin-1.0.2/
samba-2.2.5/
sqwebmail-3.3.6/
ucspi-tcp-0.88/
vpopmail-5.2.1/
[/packages]

[the Outlook Express error message]
Login failed.

Configuration:
   Account: (NEW) [EMAIL PROTECTED]
   Server: www.rain4us.net
   User name: [EMAIL PROTECTED]
   Protocol: IMAP
   Port: 143
   Secure(SSL): 0
   Code: 800cccd1
[/Outlook Express]

[snip from rc.local]
echo starting qmail
/etc/rc.d/rc.qmail start        # Start qmail

#start sqwebmail
echo Starting sqwebmail
/usr/local/share/sqwebmail/libexec/authlib/authdaemond start

echo starting Courier-IMAP/POP
/usr/lib/courier-imap/libexec/authlib/authdaemond start
/usr/lib/courier-imap/libexec/imapd.rc start
/usr/lib/courier-imap/libexec/pop3d.rc start
[/rc.local]


[snip of 'ps wx']
  191 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  192 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  193 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  194 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  196 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  197 ?        S      0:00
/usr/local/share/sqwebmail/libexec/authlib/authdaemond.plain start
  200 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  202 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  203 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  204 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  205 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  206 ?        S      0:00
/usr/lib/courier-imap/libexec/authlib/authdaemond.plain start
  220 ?        S      0:00
/usr/lib/courier-imap/libexec/couriertcpd -address=0 -stderrlogger=/usr/lib/
courier-imap/libexec/logger -
  224 ?        S      0:00 /usr/lib/courier-imap/libexec/logger imapd
  238 ?        S      0:00
/usr/lib/courier-imap/libexec/couriertcpd -address=0 -stderrlogger=/usr/lib/
courier-imap/libexec/logger -
  246 ?        S      0:00 /usr/lib/courier-imap/libexec/logger pop3d
  248 ?        S      0:00 /bin/sh /command/svscanboot
  250 ?        S      0:00 svscan /service
  251 ?        S      0:00 readproctitle service errors:
...........................................................................
  252 ?        S      0:00 supervise qmail-smtpd
  253 ?        S      0:00 supervise log
  254 ?        S      0:00 supervise qmail-send
  258 ?        S      0:00 supervise log
  261 ?        S      0:00 qmail-lspawn ./Maildir/
[/'ps wx']






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