yup dspam in 4.0.3 had some faults & so did 4.0.5 so it was finally turned off for 4.5.1
Bug 12185 - disable dspam by default Bug 12079 - turn down or turn off dspam logging Bug 13962 - DSPAM Blocks devliery when enabled
The moderator JoshuaPrismon (aka Lostknight) was the one who influenced dspam being included in the first place - it was some excellent work for for those who remember (all the way back to dspam 3.6.1)
josh, you been keeping abreast of the dspam world lately?