spamdb and greytrapping

We know spammers' “known good ”address lists are anything but

Enter obviously bogus addresses into your blacklist with spamdb -T

$ spamdb -T -a "<>"

Send email to <>, you get trapped for 24 hours.

Few if any false positives; repeat offenders stay in.

Makes a real dent in the spam not caught by greylisting.

Used by Bob Beck at University of Alberta to generate an excellent, public blacklist.