Google only replaces the From when necessary for DMARC. If a Yahoo user were to post to this list, you would see the message as coming from them via the list (it would say so in the sender's name) and the address in the From field would be that of the group. I don't know for certain whether GG also destroys the sender's address in other header fields--I never checked that--but for Mailman lists with the DMARC patch, Mailman drops a copy of the poster's address in the Reply-To field, so you can still extract and use it. In spite of this, Apple dropped the prompt asking whether or not you wanted to use the sender address when it detected that the reply address was likely to be a list posting address; I have no idea why.
As to DMARC in general, well, to be honest I'm a resigned supporter. The fact is that unlike the web, email has no definite, identifiable, user-visible author address. Yes, DMARC messes up mailing lists and spam (and the people who claim to save us from it) have won again, but we could live with the changes if we all made the best of it. Cheers, Sabahattin -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
