The 1st NDR (we will be trying for the next N days) can come in around half an
hour of no delivery. Electronic mail has a delay even when it's working
properly. That's why it's not called instant messaging. I generally expect
around a 5 to 10 minute delay on messages. I have the naïve user mindset of
checking immediately, because I know the delays are usually shorter than I
expect, but I don't get antsy about deliverability until a big tranche of an
hour has passed.
Having 7 day delivery is better than not having any delivery at all, but you do
need to balance that against disk space concerns.
On Mon, 03 Feb 2020 14:43:35 -0800
"Luis E. Muñoz via mailop" <mailop@mailop.org> wrote:
>
>
> On 3 Feb 2020, at 14:20, Michael Orlitzky via mailop wrote:
>
> > You have problems with 100% of messages 0.0001% of the time -- it's
> > not
> > a steady 99.9999 success rate, even though that's what the numbers
> > look
> > like if your window is five-years long.
>
> Since recently – heh, let's call it 5-6 years – I've observed more
> and more that senders are unable to connect the first NDR ("your mail is
> stuck, we're still trying") with their original message. There's some
> cognitive dissonance at play here. If the bounce is not instantaneous,
> that NDR is a waste of resources for them. More or less the same happens
> with the final NDR ("sorry, I give up"), where they seem to be unable to
> grasp that the message was not delivered.
>
> Setting the first NDR too soon tend to cause confusion – and often, a
> resent of the same message – which does not improve the situation for
> that specific communication.
>
> This issue is, IMO, testament that the email landscape today is far more
> resilient than 30 years ago. But we still need to accommodate the
> occasional flooded rack. User expectations are very heavily driven by
> what happens with 99.9999% of their email. Can't say I blame them.
>
> Personally, I've seen more bounces in the last 3 months due to receivers
> wanting to do TLSv1.0 than the rest of possible causes, all together.
> The NDR has helped notice this and make special arrangements. But still,
> the senders were not entirely aware of what happened to their email
> during the few hours they remained in our outbound queues.
>
> Best regards
>
> -lem
>
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