This is my configuration...I have done what all of the HOWTOs say I need to do.
qmail home directory: /var/qmail.
user-ext delimiter: -.
paternalism (in decimal): 2.
silent concurrency limit: 500.
subdirectory split: 23.
user ids: 200, 201, 202, 0, 203, 204, 205, 206.
group ids: 200...