The foundational issue here is a trade-off between information hiding
and information disclosure. Privacy vs. ops support.
It's not even privacy vs. ops support, it's privacy issues via some
hints of sender's location vs. privacy issues via the recipient
getting spammed, phished, and malware'd.
You are completely correct that there's been no discussion at all of
the tradeoffs. After all, the vast majority of mail these days is
malicious, and the largest mail provider in the world already redacts
most senders' location info.
R's,
John
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