I hate replying to my own messages, but that's the way it goes sometimes.
:)
I googled around some more after posting, and saw a message from a person
who was having a similar problem. This person carefully checked his
sendmail configuration and permissions and had success. I checked mine.
It seems I did have one or two seemingly minor problems with permissions
in my /var/spool/mail directory. In addition, I had an aggressive debug
flag in the sendmail arguments in /etc/init.d/sendmail. (I found this
page to be helpful: http://www.sendmail.org/secure-install.html.) I fixed
the permissions and set the debug flag to a less aggressive value, and I
haven't had any "not flushed" messages from fetchmail. One other possibly
confounding issue to consider was I also upgraded to the latest
spamassassin (3.0) from the last stable release (2.64?).
I did not discovered the actual problem, but the "fix" seems to be
working. I guess that's all I can ask.
Thanks for listening.
Fred
Error Loading Explorer.exe
You must reinstall Windows.