Brandon Long wrote: > What can mailing lists do today > > > 1) Reject posting from p=REJECT users > 2) Re-write From header for p=REJECT/QUARANTINE users > 3) Don't break the DKIM signature (no subject prefix, no footer) > 4) Recognize DMARC reject bounce messages and don't consider them as > reason to unsubscribe users > 5) Add a sender header and sign their messages with DKIM > 6) Add an Authentication-Results header with the auth-results for the > post. Consider adding an OAR header as well (though, this may be > premature). > > (snip) > #2 could potentially use some finessing or standardization. For > example, several MLMs are moving the original From header to > X-Original-From, I could also imagine a List-Original-From or > List-Poster header. Standardizing on that would allow clients to do > intelligent things about the display of the two pieces of > information, or handling reply-to better.
I think #2 is the way to go, and in my opinion for consistency that re-write of the From header should be done to all messages relayed trough the list, irrespective of the Sender's published DMARC policy. This also would make DMARC-checking a task not-for-the-mailing-list-program, which is better because it's simpler. In my opinion, all the other options are either too complex, too expensive, or depend on non-encouraged third parties whose collaboration is doubtful. Regards, J.Gomez
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