On Mon, 24 Aug 2015 00:13:14 +0900
"Stephen J. Turnbull" wrote:
> That does mean that anybody who can send through smtp.comcast.net can
> send as a mailbox from your domain and pass DMARC, most likely. I
> don't see a way to profitably exploit that offhand, though (unless
> you're a bank).
This
On Sun, 23 Aug 2015 11:27:57 -0700
Mark Sapiro wrote:
> You can never know if any of your intended recipient addresses pass
> through such a relay, thus my opinion is if you're concerned about
> your mail being delivered, you can't use SPF -all.
To that end, then, my lists by default tend to be
