On Thu, Nov 10, 2022 at 12:54 PM Laura Atkins <la...@wordtothewise.com> wrote:
> In many cases, the reason the mail isn’t going out through the signing > domain is because the signing domain’s anti-spam heuristics are good enough > that the sender couldn’t maintain an account there long enough to send out > any volume of email. That’s why the domain has a good reputation - because > they block spam off their network. This is a way to steal the good > reputation from the good ESP. > Interesting. Almost seems like "SPF against the signing domain" could be a win, except for all the usual forwarding concerns. 2) The messages often have two different To: lines > This violates RFC 5322, so it would be easy to filter these out, except that we would need to know how common and tolerated this is today among legitimate messages. -MSK
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