Can your SlopGenerator handle multiple mail messages per file? ...
Not as is, you'd need to recognize the "From" line that begins each message to separate them, but it should be fairly easy to implement.
If you want to implement this, I'd suggest creating a SlopRfc822Parser that implements SlopParser, and instantiate this instead of SimpleSlopParser based on a sitemap parameter ("mode=rfc822" or something). Actually this would be more an "mbox format" mode than just rfc822.
-Bertrand
