Just for fun, I took a look at my logs for August, September, October and November and looked at the hits on HABEAS_ACCREDITED_COI:
Total hits = 1009. Of those, 45 would have been filtered out without HABEAS_ACCREDITED_COI. 5 were most probably backscatter and got filtered out despite HABEAS_ACCREDITED_COI. 3 were blacklisted (by users). 565 had hits on HABEAS_ACCREDITED_COI and RCVD_IN_SSC_TRUSTED_COI. 271 had hits on HABEAS_ACCREDITED_COI and RCVD_IN_IADB_LISTED. 705 were greylisted (which means that the sending client matched certain criteria). 605 did not have a messageid. /Per Jessen, Zürich