Chris, you say Gmail tightened up their spam filters... Did this take place in the last ~6 weeks or so? I've noticed the spam filter on Gmail for Google Apps h

Chris, you say Gmail tightened up their spam filters... Did this take place in the last ~6 weeks or so? I've noticed the spam filter on Gmail for Google Apps has gotten significantly less accurate recently, resulting in far more false-positives than usual. Any ideas if this is a known issue? I can only presume it's more accurate overall, but it was definitely a noticeable change for our organisation.