Stop databasing spam?

Is there a way to STOP flamingo from storing spam messages?

We keep a pretty strict diallow keys, and if someone fails the submission due to spam, it notifies them it was marked as spam regardless. Making a long story short, we have a graph that pulls the past 14 months into a widget on the dashboard so we can see month over month Contact Form 7 leads, but it calculates spam, too. Every day or every other day, we have to purge the spam inbox to keep the graph accurate. It would be great if we could simply stop Flamingo from storing spam messages. Any help on this?