Steve Atkins <steve(_at_)blighty(_dot_)com> wrote:
Tony suggested that modifying SMTP clients to always retry 4xx responses
at a much higher rate than is currently done would be a solution to
that, and one that would be effectively free on the modern Internet.
Which is a decent observation, for some SMTP servers.
I was thinking higher but not much higher, e.g. have a starting interval
of several minutes and increase it by a small percentage each time. If a
site is deliberately deferring mail then prompt delivery is clearly less
important to them than some other consideration, so it doesn't make much
sense to bust a gut to deliver their mail asap.
f.anthony.n.finch <dot(_at_)dotat(_dot_)at> http://dotat.at/
FitzRoy, Sole: South 5 or 6, increasing 7 to severe gale 9. Rough or very
rough, occasionally high later. Showers then thundery rain. Moderate or good,