[dmarc-discuss] DMARC thwarted already?

Peter Blair popcorn at snickers.org
Thu Jun 5 13:11:46 PDT 2014

At 05 June, 2014 Al Iverson via dmarc-discuss wrote:
> And also, do recognize that DMARC is only one part of the badness
> prevention equation, it doesn't cover ever single eventuality. 


> I'd be curious about that "left off the domain" one; if an ISP were already
> rejecting mail from domains that don't resolve, I doubt it would have been
> delivered.

+1 (again).

It's a fairly prudent measure, rejecting mail with an invalid RHS with a 4XX series post-DATA reply.

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