I installed the RPM, and fought with it for days before realizing the packaged config file is incorrect.  So I downloaded the latest tarball and used the sample dovecot.conf file.  I was finally able to get dovecot to run as long as I leave the mail_location line commented out.  If I uncomment the line dovecot complains that "mail_location" is an "unknown setting".  What am I missing?

Thanks,
JB