Why isnt it standard to put the envelope sender into the
RECEIVED header?
Because it can change in transit in ways which can be confusing and
potentially reveal legitimately private information.
Can you xplain what is private about that? Thank you
See the whole history of "masquerading" in MTAs. It is positively none
of your business how other sites canonicalize senders. Or even why
that info is sensitive in any particular case.
On 10.11.22 19:39, MRob wrote:
If its private why would MTA give that information to anyone else?
this is thy MTAs don't add envelope sender to Received: headers.
Doesn't that make it non-private by default?
Each MTA in path can rewrite envelope sender, making the original private.
Putting it to Received: would make it non-private.
If none of your business, what is purpose of return-path?
it's an optional header and it's there only to provide envelope sender when
delivering to mailbox, it doesn't usually exist on the fly
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