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Theo Schlossnagle wrote:
Sorry you talk abou the receiver that uses the alias and a receiver who
controls their inbound mail setup as the same person. They hardly ever
are. One is a user and the other is a mail exchange administrator.
One does not have control over what the other does.
"Users" neither publish nor check SPF records. Domain owners publish, and
receivers check. Receivers are MTA admins, too, so they clearly should
be knowledgeable enough to at least understand (if not control) their (or
their users') forwarding setups, and thus be able to correctly configure
their MTAs.
I guess you're now going to claim that receiver MTA admins cannot easily
know their users' forwarding setups in the general case. I concede that
this may traditionally be the case, but I claim that there is no
fundamental obstacle keeping receiver MTA admins from communicating with
their users, either manually or through some technical mechanism with
which the users can easily configure their incoming forwardings to their
mailbox hoster. This is not rocket science.
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