cavelamb himself writes:

Hi Guys:

I'm going through the current topics to hopefully suggest a way to tag
valid RCM traffic.


Add RCM: on the beginning of the title line -
BEFORE the obligatory OT, OK?

Then we can filter on that tag.

Won't always work. Some of the HIPCRIME software replicates the author and subject line.
So it can copy the RCM as well. Besides - changing the Subject messes up the threading/sorting.

I just killed all postings that cross-posted to sci.crypt. ZAP - no more sporgeries.