Reply to Message

.rtf is a bit crude, but I guess it would be effective.

However, use MS Word (or similar) and stay away from fancy formatting. As far as I know, there is no requirement for justifying text, and generally indents and/or simple bullets should translate/convert correctly.

Don't use fancy line spacing either - if you're so pressed for room on a page that you have to use a 0.5 line space, then you're probably trying to convey too much information or conveying it inappropriately.