Dnia 22.11.2019 o godz. 10:45:42 Wesley Peng pisze: > > So mailing list makes DKIM or SPF failed? > > Thank you for your helps.
My opinion is that the actual problem is that people who invented SPF and/or DMARC had wrong assumptions about how email works/should work. They assumed email is a straight and simple one-to-one communication like HTTP. If you send a mail from user1@xxx to user2@yyy, it goes straight from sending server for domain xxx to receiving server for domain yyy. So the receiving server can check if the email is coming from a "valid", "authorized" server for domain xxx (despite the fact that there isn't - and never was - such thing as "valid sending server" for any domain). This concept puts mailing lists, email forwarding and similar things completely out of scope. I would dare to say that these things simply did not exist for inventors of SPF/DMARC. That means, they obviously knew these things exist, but assumed they are completely unimportant and shouldn't (in their approach) be used. Big email providers started adopting SPF/DMARC etc. also without much thinking about these seemingly "unimportant" use cases, and then suddenly it turned out that we have quite a problem. You may disagree of course, but that's just how I see it. There is a quite old article about why SPF is wrong, but in my opinion this article didn't date a bit: http://david.woodhou.se/why-not-spf.html -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub."
