Robert Heller writes:

 > All three of the comcast bounces were @cable.comcast.com addresses.
 > Other comcast address (all @comcast.net) went through fine.  The
 > @cable.comcast.com were working for sometime.

Well, comcast.net is participating in DMARC, while neither comcast.com
not cable.comcast.com are.  I suspect that they've decommissioned
those domains for incoming mail completely, and so assume that any
mail going to such addresses is spam based on old lists.

Steve
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