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I'm looking for the type of functionality that Ben mentions, and, for those of you who don't see the point, consider this:

I need to set up a network of message boards to sit on a company intranet.  All of the staff use Blackberrys, and the problem at the moment is that if they're ill, or trains are running late, they email late@companyname.com, and everyone gets told.

They'd like a message board (for that's what it really is in this case) for notices from staff.  Emails to an address would automatically be posted into the appropriate forum, perhaps depending on the address they've used.

Make sense?

Any ideas how to do it?!