On Sat 10/Feb/2024 13:10:19 +0100 Archange via mailop wrote:
Le 10 février 2024 15:12:29 GMT+04:00, Hal Murray via mailop
<[email protected]> a écrit :
I was picturing something like:
user goes to final MTA and says I want you to accept forwarded mail for me
from example.com
then he goes to example.com and says "please forward my mail to
[email protected]"
example.com would then contact final.com and say "OK if I forward me's mail to
you?"
If yes, then example.com says "Here are the IP addresses I use for
forwarding...."
I had a similar idea but much more simple: we just keep the part where the user
says to the final MTA with which they have [email protected] that they are
“forwading from [email protected]”.
Then, when receiving an email SRS rewritten from forwarder.org to that
[email protected], the final MTA could check DKIM against the original domain but
SPF and ARC against the forwarder domain since it is expecting mail to be
forwarded that way for that user. Kind of a new domain alignment.
That would work indeed! And it matches the intended use of ARC, so it would
work for mailing lists as well.
The difficult part is having the user do the liaison correctly, but then it has
to work only for the class of users who are able to set up forwarding and/or
subscribe to mailing lists.
I even wrote a draft[*] for a protocol whereby a forwarder can ask the final
MTA to get its own user's confirmation. The user would then receive something
that looks like a (second) opt-in confirmation message, pointing to her mailbox
provider's.
I asked Gmail if they would experiment with it, but they found it overly
complicated, and after a brief discussion don't seem to be interested. I
should look for some other receiver(s)...
Best
Ale
--
[*] https://datatracker.ietf.org/doc/html/draft-vesely-fix-forwarding
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