Well... we don't make any exceptions in the SFDB database! Usually SpamFilter will "trust itself", so that emails originating from the SpamFilter itself are not blocked. This occurs if the email originates from 127.0.0.1 or "localhost". If this is not the case, and the email appears to originate on a different IP, that email can be blocked if the filter settings are not configured to allow it to be relayed.
In regards to the SFDB, this is also usually not an issue, as in this case, even if your own SpamFilter will report its own IP to the SFDB, the IP will not be blacklisted, as it takes several reports from multiple locations in order to cause the IP to be actually blacklisted. Yours will only be an entry, but not a blacklisting. For example, if you look at the left side on this website, the counter of IPs in the SFDB lists the acual number of IPs that are being blacklisted. In reality, there's usually about 3-6 times as many IPs in the database, but they are not blacklisted.