I am interested in creating a rule that would give extra points if a message appears in multiple blacklists (NABL, SORBS, etc). The idea is that if a message gets a hit in 3 of the BL, it is more likely than a simple additive effect of appearing in each one individually.
What would such a rule look like?
Something like this: (2.5x and higher only)
meta RCVD_IN_MANY (RCVD_IN_DSBL+RCVD_IN_NJABL+RCVD_IN_OPM+RCVD_IN_SORBS) >3
score RCVD_IN_MANY 2.0
