Question on setting up dovecot

[Jeffery Small]

Many thanks to Joseph Tam and Steffen Kaiser for pointing me to the logging
information that I should have been using in the first place.  Now that
I have separate log files and debugging information, I'm still at a loss
to see why the mail is not being pulled over from the Linux system to the
Windows 7 machine.  To recap, here is the output from doveconf -n:

----------------------------------------------------------------------
# 2.2.18: /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.8 (0c4ae064f307+)
# OS: Linux 4.2.0-27-generic x86_64 Ubuntu 15.10 
auth_debug = yes
auth_verbose = yes
disable_plaintext_auth = no
info_log_path = /var/log/dovecot.info
log_path = /var/log/dovecot
mail_debug = yes
mail_location = mbox:~/lib/Mail:INBOX=/var/mail/%u
passdb {
  driver = pam
}
protocols = imap pop3
ssl_cert = </etc/dovecot/dovecot.pem
ssl_key = </etc/dovecot/private/dovecot.pem
userdb {
  driver = passwd
}
userdb {
  driver = passwd
}
verbose_ssl = yes
----------------------------------------------------------------------

Here is the configuration logging/debug info:

----------------------------------------------------------------------
log_path = /var/log/dovecot
info_log_path = /var/log/dovecot.info
auth_verbose = yes
auth_debug = yes
mail_debug = yes
verbose_ssl = yes
----------------------------------------------------------------------

And here is the complete set of Debug/Info information logged when Outlook
on the Win7 system attempts a Send/Receive operation.  Long lines broken
for readability:

----------------------------------------------------------------------
Feb 11 08:47:49 auth: Debug: Loading modules from directory: \
		/usr/lib/dovecot/modules/auth
Feb 11 08:47:49 auth: Debug: Read auth token secret from \
		/var/run/dovecot/auth-token-secret.dat
Feb 11 08:47:49 auth: Debug: auth client connected (pid=7861)
Feb 11 08:47:49 auth: Debug: client in: AUTH    1   PLAIN \
		service=pop3    session=dF2ST4ErtQDMa1sC \
		lip=<server_IP>    rip=<client_IP> \
		lport=110 rport=54453 resp=<hidden>
Feb 11 08:47:49 auth-worker(7864): Debug: Loading modules from directory: \
		/usr/lib/dovecot/modules/auth
Feb 11 08:47:49 auth-worker(7864): Debug: pam(sherril,<client_IP>): \
		lookup service=dovecot
Feb 11 08:47:49 auth-worker(7864): Debug: pam(sherril,<client_IP>): \
		#1/1 style=1 msg=Password: 
Feb 11 08:47:49 auth: Debug: client passdb out: OK  1   user=sherril
Feb 11 08:47:49 auth: Debug: master in: REQUEST 1975517185  7861    1 \
		b48910c85f39498e2fe83277d7e94028    session_pid=7866
Feb 11 08:47:49 auth-worker(7864): Debug: pam(sherril,<client_IP>): lookup
Feb 11 08:47:49 auth: Debug: master userdb out: USER    1975517185 \
		sherril system_groups_user=sherril  uid=1001 gid=1001 \
		home=/u/sherril
Feb 11 08:47:49 pop3-login: Info: Login: user=<sherril>, method=PLAIN, \
		rip=<client_IP>, lip=<server_IP>, mpid=7866, \
		session=<dF2ST4ErtQDMa1sC>
Feb 11 08:47:49 pop3(sherril): Debug: Effective uid=1001, gid=1001, \
		home=/u/sherril
Feb 11 08:47:49 pop3(sherril): Debug: fs: root=/u/sherril/lib/Mail, \
		index=, indexpvt=, control=, inbox=/var/mail/sherril, alt=
Feb 11 08:47:49 pop3(sherril): Info: Disconnected: Logged out top=0/0, \
		retr=0/0, del=0/3, size=36928
----------------------------------------------------------------------

There are no errors.  We have a pop3 connection.  The user's name,
uid, gid, password, home directory are all correct.  The inbox is
listed as /var/mail/sherril which is correct, and this file has the
correct ownership and permissions:

# ls -l /var/mail/sherril
-rw-rw---- 1 sherril mail 194900 Feb 11 09:00 /var/mail/sherril

Yet, no mail is pulled over.  Are there any clues here?

Thanks,
--
Jeff