I think that the conditional functions (the ones you only use in the IF statement) proposed by [EMAIL PROTECTED] shold be in maildrop because in a tyipical filter these are evaluated each time a message is delivered.
Define "typical filter". To me a typical filter means: depending on the message's contents, deliver to this folder, or that folder. Or, perhaps, discard the message; or maybe forward it.
These things can be accomplished entirely by the existing facilities in maildrop. When you start doing things like checking if an external file exists, creating or removing directories, I think you're getting beyond what a typical mail filter does.
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