[Mailman-Users] Question about rejection messages.

[Stephen J. Turnbull]

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