It appears that Dr Ajay Data via UA-EAI <ajay@data.in> said:
-=-=-=-=-=- -=-=-=-=-=-
In this discussion we are missing the important point here.
In mailing list communication there is no CC, BCC , it's always FROm mailingList to TO id, and hence there is no visibility required for ASCII and eai addresses to each other and hence no complications.
In the mailing lists we run, the From: address is the address of the author of the message, or sometimes a version of the address modified to survive DMARC rules. I know a lot of lists now substitute in the list's address, to work around DMARC damage, but the IETF is finally working on fixing that. The usual approach with anti-DMARC'ed lists is to put the original author in the Reply-To header, but of course if the author has an EAI address, you can't sent the message to non-EAI recipients. There is no way for the ASCII recipients to respond to the author, or even to tell who the author was. This situation is a mess and there is no good solution short of the entire world adopting EAI. R's, John