On Fri, Aug 24, 2018 at 02:51:08PM -0400, Andrew Sullivan wrote: > This feels like you are reinventing DMARC or maybe DKIM and needing to > invent ARC to solve the problem with mailing lists. Have you looked > at those systems? > > A
I had not looked at ARC, but if I am not mistaken... isn't ARC something that a mailing list server needs to support, which is something I wouldn't have any control over, right? I don't see how that would help me for filtering on my end. Also it is my understanding that SPF and DKIM suffer the same issues... if the mailing list is configured incorrectly then when I receive an email from a list it won't pass SPF and/or DKIM. In my mind my tool is different because I *know* how my server is set up and I'm trying to block messages that I know are invalid based on that knowledge. But I'm asking the list because I recognize my knowledge is incomplete... Ryan
