I'm seeing some false positives for mail from .comcast.net hosts that are
falling into various ip4r lists.  It's very sporadic.  It seems like quite a
few are being "tested" as mail relay hosts, but aren't.

Other providers provide a sensible naming convention to make it
straightforward to identify what server is really a comcast.net server as
opposed to just some server on their network, but these guys are fond of
host names like:

rwcrmhc12.comcast.net [216.148.227.85]
sccrmhc11.comcast.net [204.127.202.55]

... Or is it as simple as .comcast.net only appears in their valid hosts?  I
dunno.

Is there a clue in the business relationship between AT&T and Comcast?  I
dunno.

Andrew 8(

(I just wasted too much time checking for false positives... I found a very
few but the time involved made it an expensive proposition)
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