Please refer to the original post in this thread. It contained the line:

(Private replies please)

This is good, as it reduces the amount of off-topic posts on the list. I
am reasonably sure that most of the subscribers aren't interested in
seeing a whole flood of answers to someone else's question.

Several people ignored the above line, and sent answers to the list for
all 1100+ people to see. This is bad. It's inconsiderate, thoughtless, and
if it happens again I'm going to be rather upset with the people
responsible.

-Tybalt