Re: [ietf-smtp] broken signatures, was Curious

John R Levine <johnl@taugh.com> Wed, 22 July 2020 02:03 UTC

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Date: 21 Jul 2020 22:03:36 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "John C Klensin" <john-ietf@jck.com>
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Subject: Re: [ietf-smtp] broken signatures, was Curious
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On Tue, 21 Jul 2020, John C Klensin wrote:
> While I mostly agree, we should not lose sight of the fact that
> there still people using the Internet in less-developed
> countries, isolated locations, over intermittent connections,
> etc., where bandwidth tends to be scarce and expensive ...

Sure, but if that's the issue, you don't address it by messing around
with individual mesage headers.

Back in the day we sent compressed batches of messages over uucp.  I 
expect something like that (or maybe exactly that) still works.


> In addition, if a possibly-legitimate, possibly-phishing,
> message comes along, I'd really like to see us (and our MUAs)
> encourage users to look at headers, understand what can be
> trusted and what can't, and so on.  Perhaps the educational
> effort that would require is hopeless under the best of
> circumstances, but it is certainly impossible if we facilitate
> and encourage an ever-rising collection of noise header fields.

That battle was lost over a decade ago. See for example the headers
below that I took from a message that came through one of my mailing
lists today. They'd be even longer if the message had started at
Google's webmail rather than a MUN on the author's phone.

R's,
John

---- snip ----

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