> On 19 Jun 2022, at 20:22, Dave Crocker via mailop <mailop@mailop.org> wrote: > > It occurred to me that it might help for me to provide more context to the > questions I asked. I was possibly relying too much on the thread context... > > > On 6/18/2022 3:40 PM, Noel Butler via mailop wrote: > >> I was a very early (even in testing) user of SPF, It's rather commical >> reading these FUD sayers about SPF and mailing lists, it has never been a >> problem with mailing lists, not using mailman nor its more common >> predecessor majordomo, and I've never noticed anything wrong with qmail >> users ezmlm. > > This establishes the context of SPF and mailing lists. Hence my question. > > Also, the above text makes the incorrect assertion that this isn't a problem > when a message passes through a mailing list. However, SPF breaks even with > basic MTA relaying, nevermind mailing lists -- unless the MTA is registered > in the SPF record. The delivery/re-post behavior of mailing lists not only > breaks SPF but almost always also breaks DKIM. (This latter point is what > motivated ARC.)
Most modern mailing lists rewrite the 5321.from by default so they can bounce handle. I don’t think SPF breaks mailing lists as much as folks claim. I have heard, and in the past made, the “SPF breaks mailing lists” but I stopped saying it because it’s not true in the vast majority of cases. For instance, the 5321.from on this list is boun...@mailop.org <mailto:boun...@mailop.org>. Looking at other lists in my mailbox it’s similar. Mailing lists rewrite the 5321.from and thus does not break SPF. It does break DMARC, but that’s another discussion. laura -- The Delivery Experts Laura Atkins Word to the Wise la...@wordtothewise.com Email Delivery Blog: http://wordtothewise.com/blog
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