Yeah, there are two options for forwarding, to rewrite the envelope sender
or not, and both seem pretty common.
Mailing lists almost always rewrite, so the sender doesn't get bounce
reports for the entire list, and so the list can handle bouncing users by
removing them. Granted, mailing lists
You are right that would create many queues
connecting to different MXs. That could results in 10+ queues all
connecting to the same MX, like hotmail.de,hotmail.es,hotmail.fr,hotmail.it,
hotmail.se which all use hotmail.com's mx records and potentially flood the
same mx with too many connections.
That's practically bad idea, you will not be able to send an e-mail to
user who has redirection to another account. If, for some reason, you
really want to implement it, you can remove DKIM signature or sign your
messages with unaligned DKIM domain. In this case DMARC only uses SPF
for
What about the idea of extending DMARC to allow a domain owner to
publish a policy that says "All email using my domain in the SMTP Mail
From must be aligned to the From: header domain." DMARC already has
the subdomain policy capability, and alignment could be achieved using
DKIM or SPF for
