None; this is a news group! That is, there are no rules enforced by the
software. There are periodically discussions on c.d.i about what should
and should not be said. This is my FAQ, so it gets my spin on the rules
that should be followed.
* Format: HTML postings are strongly discouraged; so are MIME
postings. Both cause problems with many frequently used news
readers. That means that attachments aren't encouraged either.
Also, sending the same information twice, once in HTML and once in
plain text, is downright wasteful.