In article ,
Mark wrote:
I'm happy with top posting for emails. They are usually a one to one
'conversation' rather than the free for all of news. So you might be
expected to remember what was said last.

In this case quoting should not be necessary at all.

No - but it's common practice to copy the mail you're replying to below.

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*When companies ship Styrofoam, what do they pack it in? *

Dave Plowman London SW
To e-mail, change noise into sound.