To recognize, if a message is spam or not, it would be great, to see the subject line. As it's possible to pipeline the postfix rejects to a late state, it would be possible to fetch this detail and show it in the tracking center and statistics. Would help, to determine, if a message, which has been blocked, really was spam or not. Really great would be, to have the full message (if enabled) for a timeframe to be set (e.g. 7 days) in the tracking and statistics.