[OT] MUA's with "direct post" support?

[Kevin P. Fleming]

I'm looking to set up shared folders to use as discussion boards, as 
well as possibly to use the new NNTP functionality to mirror some 
newsgroups into shared folders.

However, that pretty much dictates using an MUA that supports "direct 
posting" of messages into those folders, rather than requiring them to 
be sent into the folders via SMTP (at least that's the way it seems to 
me). Anyone have any suggestions? I'd like it very much if I could get 
SquirrelMail to do this, but I'd like to try out any other alternatives 
to see if this technique is going to work.

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