"No, that's wrong" or "I agree".

Many people feel that this cure is worse than the original disease,
and there soon appeared newsreader software designed to let the reader
skip over included text if desired. Today, some posting software
rejects articles containing too high a proportion of lines beginning
with `>' -- but this too has led to undesirable workarounds, such as
the deliberate inclusion of zero-content filler lines which aren't
quoted and thus pull the message below the rejection threshold.

Because the default mailers supplied with Unix and other operating
systems haven't evolved as quickly as human usage, the older
conventions using a leading TAB or three or four spaces are still
alive; however, >-inclusion is now clearly the prevalent form in both
netnews and mail.

Inclusion practice is still evolving, and disputes over the `correct'
inclusion style occasionally lead to [132]holy wars.

Most netters view an inclusion as a promise that comment on it will
immediately follow. The preferred, conversational style looks like
this,
> relevant excerpt 1
response to excerpt
> relevant excerpt 2
response to excerpt
> relevant excerpt 3
response to excerpt

or for short messages like this: