Business reply style

I mostly use the "usenet" reply style of selective quoting and replying 
interleaved. This makes the most sense in mailing lists, where newcomers 
can read the list's archives to get the context.

But in business correspondence, new correspondents randomly join a 
conversation and need to see the full context of a long email exchange 
that's not archived in a central location, so the reverse full-quoting 
style is needed in which all previous emails show up below one's response. 
In this style it's desirable NOT to put quote characters (eg. "> ") in 
front of each line. Is there some way to do this selectively by folder or 
account in Mulberry? I can't find a setting like that. I have folder 
hierarchies for customers and vendors and I'd like to apply that reply 
style to just those trees.