> IsBackScatter
> 
> IsNotBackScatter

Just in case; let's say ASSP gets a message from
postmas...@.... it checks the "signature" (either
BATV or FBMTV) and eventually checks the sender
IP against the backscatterer DNSBL; at this point,
in case of any "hit" the message would currently
be rejected as backscatter, but, using the regexp,
ASSP would then check the message against the
regexps which may either return

* yes - it's backscatter - reject it

* no - it isn't backscatter, proceed with further checks
         and eventually reject the message as spam or
         accept it as ham

* neutral - check the current score and act as needed

so, using some proper regexps one may allow emails
from "postmaster" to get in w/o being incorrectly flagged
as backscatter and still reject true backscatter ones


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