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Currently SmarterMail will create a .eml file for any emails that a user manually marks or unmarks as spam via the web interface for the purpose of training the bayesian filter. These are stored in Service/Spam|Ham/Type. The details of this are explained here
. This is wonderful except for the fact that a *lot* of people never use the webmail! (about 1% of my users use webmail)
I see no reason that the same couldn't be done for email users via IMAP. That is, when a MOVE command is issued for a message into the "Junk E-Mail" mailbox consider this the same as a user clicking Junk from the web interface. Similarly, when a message is moved out of Junk-Email into any other folder besides trash (or even just the Inbox) it is considered Ham.
POP users are SOL..