A few days back, Hawk Wings had an interesting post about Why Mail.app quotes the way it does. The post linked to the "format=flowed FAQ", which is a great piece that explains how format=flowed quoting works, and why it is a good idea. I’ll update my page about good quoting practice (and the corresponding post) to include some of the material from there, and a reference to it.
Quoting and flormat=flowed
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TonyAndrewMeyer 