since Marc is present on this list and maybe others using it too:
dig A c134389d7cefd3aadce78714669239f2.ixhash.junkemailfilter.com.
status: SERVFAIL
Query time: 1798 msec
so at least for the last 2 days the rule below slows down scanning
score JEF_IXHASH 1.0
ixhashdnsbl JEF_IXHASH ixhash.junkemailfilter.com.
body JEF_IXHASH eval:check_ixhash('JEF_IXHASH')
describe JEF_IXHASH DIGEST: ixhash.junkemailfilter.com
signature.asc
Description: OpenPGP digital signature
