On Mon, 26 May 2025, Randy Bush wrote:
On my small system I feel pretty much the way you do, but large
systems have different issues. Someone will get a plausible sender to
send them a message with spammy contents, then they will resend that
message unaltered to a zillion recipients at large mail systems which
is hard to detect quickly since the DKIM, DMARC et al. are all OK.
Being able to see there is an extra hop or two in the path that
doesn't look like a mailing list is useful for them.
and 30+ years of email content and protocol hacking driven by that view
has worked sooooo well
I go to a lot of meetings with people who run large mail systems, but I
don't think I've ever seen you at one.
If you have some key insight we've all missed, and that will work at scale
for mail systems with billions of users, let me know and I'll pass it
along.
R's,
John
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