On Tue, Jul 21, 2020 at 1:19 PM John Levine <johnl(_at_)taugh(_dot_)com> wrote:
As useless mail headers do make emails heavier, I am in favour of
removing DKIM-Signature headers, that are known to be broken, e.g.
because the current host has modified (and resubmitted) the message.
The amount of bandwidth used by e-mail is a rounding error of the
Internet's total, which is mostly video these dayts, and the amount
used by broken headers is a rounding error on that rounding error.
Look at the headers of the mail in your inbox, particularly mail from
large providers, and you'll find megabytes of headers that nobody is
ever likely to look at or use. This battle was over decades ago.
A better (but annoying) reason is there are a smattering of servers which
based on broken DKIM signatures, against the rfc.
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